aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~dehŠ*(\ “iÝ>dehŠ•l...

30
() $%9òH(89:;<=¢æ>ZUMN DEFG>MNODEIJMN 8 9:;<=l(\MQ ÂBÐRQ<=|B>º¦0ÒOÅý ÚÚ·ÆQß=RQ #V> |:RQE¤/Z G0òÑÒDEE¤>MN !"S¬M>ò> FGôMNòÏ DEE¤>IJMNlRQEMNO<=EMN>@A !"<}þÏ ÒDEEMN µòßRQE <=Edþª|ÿä>¬ ĪS>no $%Í¢X[\P¤ e7DE `öDE ÑDE !" XY ! e7DE>TÖ lþªl4N~>e7ä> »Ól£DEˬ>4NOe 7 X£0$×Î>ç :; h a(ÅMNÑ'Ò Ó¾1¤4N7qD E~e@A ! e7DE>TO\M l#DEUV>Î`[e7> DE>h DE >T DE>\MØ oU=DE>ÉAËIQ©M~>TO×Î » l89:;ÉÊdq>(\T½ó ! e7DE>r l<=(?D:M¾£DE>@$rS>e7 ¾ep89 :;:(ÅÏÒUVô>IJMN !"òe7DE>4ÇrWX¯>DE \M¸Õ Wâbm>PQ ./89:;>ÊR £DE:}ÑOIJ $" bXY 89:;@Y£¬MDE>4N ~ÉÊâ89:;>,â89:; >d$ º¦ª ò#L¬>DEç`öSØ©ô>DE:}4N ½; `a¾S Ø©ô>DEl(ÌUV %" XY 787N 7~>DE 4NDET0b §c4DE <=DEhUVcþ(\gh> ([> S(> =Y4N>DE«

Upload: others

Post on 10-Jul-2020

2 views

Category:

Documents


0 download

TRANSCRIPT

Page 1: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

! " # $ % & ' )

!

"

"

' ( @ A

$%9òH(�89:;<=¢æ>ZUMN

!

�DEFG>MNODEIJMN

%

8

9:;<=l(\��MQ

!

ÂBÐRQ<=|B>º¦0ÒOÅý

!

ÚÚ·ÆQß=RQ

#lµV>

!

|:�RQE¤/Z

!

G0�òÑ�ÒDEE¤>MN

!

!"S¬M>�ò>

FGôMNòÏ

%

DEE¤>IJMNlRQEMNO<=EMN>@A

!

!"<}þ�Ï

ÒDEEMN

!

µòßRQE

$

<=Ed¶þª|ÿ!ä>¬"

!

ĪS�#>no

%

$%�Í¢X[\P¤

'

e7DE

$

`öDE

$

�DE

%

!"

��XY

!

e7DE>TÖ

!

lþª|£l4N~�>e7ä>

!

»Ól£DEˬ>4NOe

7

!

X£0$×Î>�ç

$

:;

$

h�

%

a(ÅMNÑ�'Ò

!

Ó¾1¤4N7qD

E~�e@A

%

!

e7DE>T�O\M

!

l#DEUV>Î`[e7>

!

BÐDE>h�0Ó

$

DE

/û>T�

$

DE>\MØ

%

oU=DE>ÉAËIQ�©M~�>T�O×Î

!

»

l89:;ÉÊdq>(\T�½ó

%

!

e7DE>r�

!

l<=(?D:M¾£DE>@$r�S��>e7

%

¾ep89

:;:(ÅÏÒUVô>IJMN

!

!"�òe7DE>4Çr�WX¯��>DE

\M¸Õ

!

W�â=¯bm>PQ

!

./89:;>ÊR

!

£DE:}Ñ�OIJ

%

$"

�bXY

89:;@Y£¬MDE>4N

!

[¶~ÉÊ��â89:;>,�kò�â89:;

>d$

%

º¦ª�

!

�ò#L¬>DEç�`öSØ©ô>DE:}4N

%

½;

!

`a¾S

Ø©ô>DEl(ÌUV

%

%"

��XY

787N

$

�7~���>DE0Ó

!

��4NDET�0b

!

§�c4NÓDE0Ó

!

<=DEh�UVcþ(\gh>

$

([>

$

S(>

$

=Y4N>DE�«

%

Page 2: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

¿`a>DE

!

7ǧµo)0=Y89:;RQ

!

�l�ò:}º¦Ñ�

!

dDER

$

DEÙ3Õ

$

DE\M>:(ÅÑ�ØØ

!

Wý¾�<89:;RQ>ò�

%

$"!#

8BC+DE

òe7DE

!

�ò#DET�FG&'

!

9òBÐC\P¤

!

(\l#~�äe7

!

(

\l#UVäe7

!

Drϵi4

%

DET�FG7Ç#�DE4Nýû

%

�DE#UVä

6

!

l;{DE>DE

!

Ólå¼!"7¯6>DE,c>ÐÑ

!

lW�DE4N!"»î

¾DE,c4N

%

DE,cl;{DE¬>��

!

ÄýDE,c>4N

!

!"iW)wú�

DE\MODEh��S(>Ä6OP_

%

78�DE>4N

!

!"iW78h�ï~lS

>DE¬

!

�$S(�=Y4N>DEQR0Ó

*

78ÖQ>4��TDEOKE"T>D

E

!

iW'ÕDE4NÉÊ

%

�DE4NiW®!"Q>��7lS>ï~DE¬�>��

ô\

!

§d¸��$Â"

!

WQPlS>DE\MXÉÊ>2@:}

%

78�DE>4N

!

!">�×Ê>lòP%DE\M

$

DEh�ODE4N]\0Ò>2@æ}

%

$�01��~���

$

T���

$

DE\MFG

!

WXDEh�ØP¤>BC

%

$"!"!#

���M

ST~�DE4N

!

9ò�²C\P¤

'

ghôOi�ô

%

DEghôlK�òÈÉ>

¹�]_`>VðBClµl¾V<=¹�>9òrÍ

%

`d

!

!"£�Ê>DEghô:

}4N

%

|���

!

ghô4Nl#~�É&'>

%

¨

#."

l=°>~�½Q

!

l�Ê~�É

>(­4

%

¨

,#."

~�É>°\0Òílh\~���>�ò�d­4

!

»l~�DETÖ>¬%

%

~�

ÉTÖ>DE:�DE7

!

ÓIdeDEÉ

!

#.#

l+

%

¨

,#.#

%" ,

!"#$%&'()

!

*#+,-./01

Page 3: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

~�É>ËØ¢æ�ò]^�Ë

%

a^]^¢æ

!

G0l�Ø8c>~��ò

!

�µl

,

¨

,#.$

G0¾eý¾89:;>�ò

%

|:}8

9:;ª

!

�ò£/~�ÉODEÉ

!

W

&ZDE>ghô

!

#.$

l+

%

W=°Ëª

!

~�É>¬­4,DE

ÉlVð

%

�irµ=°�§ùSDEÉ

>�<]^

!

»ÓlùS(\°±µ=,

�©

%

|�Ø}~

!

(¼Ëª

!

°±>µ

=2ß=Ál:æ}

!

)S°±]å1

!

l:PiW#°'vö°±

!

n1­(w

�ÆQµ�

"

2pw�»¦

$

½w

#%

»

Ólª-D>°±iWʾÂ,w�ß=

>

!

a\ÓÊ/¾�T×Î

%

DEÉl~�DE>i0´Oâç­

4

!

DEÉ>BC£tBÐe½Q>lS

BC

%

!"ª>ghô

!

K>lDEÉ>

ghôlUBêe!"�ò>lSDE

%

DEÉS¦^Ib

!

Çy>IbS©É

%

©É��ò©B¾Sghô»�ò©û¾

Sghô

%

©B>ghô

!

lK©B>DEùSEpOPQ

!

�£Y¢X9~P¤>QRP

Q

!

�ò}~9ãµÕÑ�

%

©ûghô

!

9ò�²9�HW�>T�

!

Â"<=e©ûT

�l(£¦>T�

!

#l¦£¦>T�

!

l�)Ó>T�#l$�)Ó>T�

!

!"·|1

¤>oÒ�HX

%

DE>i�ôBÐB­W�ôOW­W�ô

%

DE>i�ô

!

(\K>lDElUW�

!

IdDElU*¤

%

þª|*¤DE@Aä>×ÎOë컵lW�iÝ>

*

DlKDEl

UiÝ

!

Idw�Ó�>�ÊËZ

!

ÁYùSËÚX:}]^¨©

!

UiÝôÓZY¿¤e

]^tò¨©

$

àáûVOw�¨©1>¸ÊËZ

%

�i�ôÛ>DE

"

Z�`DE

#

lU

"=�

&

lUÓde+,DEe�

&

Idä{>�ÊËZ��>i�`ZY¸ÊËZ��>

i�`

%

�ÊËZ±ni�`fZ

!

[l!"iW4N|3?w^äi�`Z

!

¾³´Z

!

#�uÕú��ÊËZ>ÆQ2

%

lWª

!

i�`Z>DE»lS=>

%

Ã(P¤

!

Sªl

�+,DE#iolùS=£�P>DE

!

µ(ÅWl+,DE

%

�E¸�>¸Õhh·l

mäE

%

º¦89:;MQ,�µ�Y

!

áq­4�½|YDEEùSÑ�Ò

"

iA/�

ô¤<.[>÷ø>`0

!

y$%

#2$

Ò

#%

ÃW

!

µ¶}~v�>DE¬

!

tnñ*}~r

Í>lm

!

)Se7}~PiW¯Ò>Ñ�DE

%

�e7}~»Ól¾89:;><=ùú

0$×Î

%

&"

2

#

3

,

, - 6 7

,

Page 4: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

$"!"$#

?@�M

¶=89:;7Çl@YÁ~�����TÖ>¬MÖTDE

!

�a?DE¬¦ípã

|¬ÓT�DE7�

%

lW|89:;MN&'WZ

!

Gò>l4N~�DE7�>DE~

�T�

$

DEUVT�ODE;{Ø

%

DEUVT�FG

!

9ò4NddT�DE7>©û

T�

$

W�O9�>T�

$

©û(£(T�

$

(£¦T�

$

¦£¦T�

$

DE>�)T�H

$�)T�

!

WX©B@L/û>T�

$

'-)ØØ

%

$"!"$"!#

NODEPQ

T���*+©û2DE7/û>T�

!

9òFGT�DE7>©ûT�

!

dC\DE

©>W�O9�>T�

$

C\DE©ûDM£<T�

!

WXC\©û�)T�Ø

!

iWß=

T�.7O��M¾ËFG

!

»iW�M4N

%

º¦ï~PS¬M>DE

!

dÿ³DE

$

<¶DE

$

T±DE

$

~�/NDE

$

~�4NDE

$

0�DEWXrÅ}~>rsDEØ

%

!

a?DEí·1£!¦DE¬

%

T�.7O��M¾

!

iW78µ¶><=Q3uÕ

DE4N�7O��lSa?DE

!

WXDE>ˬOT�Ø

%

a?DE��T>]^iop|Y¶(DEeº

$

µ¶DEeº2µ¶DE7�

!

io

S¦²]^

%

78T���

!

!"iW4N~�DEˤ¹�'¸Õ

'

!

T�©/ûS³´2|T�

&

!

d�S(\9�OW�T�

!

lUiæ}©û/N

&

!

d�S(\«Q>2�Z>9

$

W�T�

!

lUSÿ!©ª>DE

&

!

S�%>]^Ñ

&

¨

#.!

j+eC\9�OW�>T�XC\DE©ûDM£<T�

%

¨�C\Ö¾>DE

©l3©

!

C\×¾>DE©l0©

!

C\3©>$$

CF

@L¾9�

!

C\0©>$$

CF

@L

¾W�

%

¨�ä¾>C\DE©>DE�çf¬

!

�¾>C\DE©>DE�çfo

!

Æd

¨�ä�C\+ã¨l+>�4

%

78£�DET�>�7

!

iW�§2r.7µ¶©û>

DE

!

§W;õÚ(\([>

$

4(>]^

%

$"!"$"$#

NRDEPQ

T���*+©B@L/û>T�

!

9òFG'Üô

$

'QR�TØ

%

£DE©B�D

E0Ó4N

!

9òl#°\DE¬�úö�DE

!

BÐ@LGî

$

@LDEåÓ

$

@LDE

§`

*

If@L>Gî

$

åÓ

$

§b

!

ß=05.7RQËÎ52|>-)OT�

*

'¸-

)DE§|�DE67BÈR-)Ê^

%

(7DET�,Î5

!

iW78Î5-)>ioô

$%O®:a?T�

!

78DE¬$%T�

!

ß=¦\DE¬Î54NËQÅKÅ�>'

%

$"!"%#

XY��de

ÿ!DE\MÉÊí�òñ©O4N�DE

!

W�Ô¤e7ï~��

%

!"iW8;l

'" ,

!"#$%&'()

!

*#+,-./01

Page 5: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

SåÓ>DEËQÅUT�>�DE

!

�DE©«mZDEB>r�

!

Id=DEåÓ

$

@

L§`Ë&ÅDE>4(ôO@LlUiWEp2 KØ

%

#.%

l+

!

!"iW�*�\

�:DE©

[K/R\ +]L\ TP/++

�@L>­4K

%

©

#."

ª«a\@L>�T��

%

¨

,#.!

¨

,#.%

,

$&!#+,-./012/34-00

����

�XY� �XY�

)=>=̂ ?Z@ _/̀ T8/̀

SNC3=N?-@?T=DFCF=>@ *4

]DCaG@T4GD> !#0

]DCaG@D@EEb 0201'1b

RCDC3G3_=5G@ "! $.

!

.)

Ú,e

R=AC3G3_=5G@

9I:;<`:$

RCDC3G3P@D9>< '

R=AC3G3P@D9>< "&

*G55T4GD> 0

T4GD> !$$'$!

!

d�DEO�DEµ([

!

·p!">DE\Mc)ODEh�MN²d��>

("

2

#

3

,

, - 6 7

,

Page 6: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

,

$&$#

����,

�� ��X �=;

111.111.1111 $"'' 1'2&$

"111#111.1111 !# "2#(

111 111 1111 $! "20!

111.111.//// #0 02'"

1.111.111.1111 % 02"%

4><@NE ' 02"(

lm

%

`d

!

�â(\

"000

±}O§`¾

#%%

\@ô>@L

%

d�|DE��§>DE�ó

l

#00

\@ô

!

Å->@L§`Iò�>§

!

 ·=D

%%0RL

>>? û

%

d�@L�¸�

eµ}S>EpK

!

<=S0}DEªio·@P

%

$"!"%"!#

ST>U

0b4Nl$%DEâ=RIÕ>0b

!

l(\7Ç=YQÅ@L�>DElUô�§

bò�>UV

%

`d

!

¬ÔAH2rT±RÎôØ@Lhhí·¾Srŧb

%

0b4Ns

t$%@L�>DEHDE¬lU�¶

!

Wý¾

DE4N>�ò

%

!"iW4N'EDE

!

n1

&'cþBÆO$%ë 

%

£Yÿ!DE

!

!"

íiW!0b4Nmd(\iæ}>DE7?~

�½Q

%

©

#.#

¾(\ÞC¬>¬ÔAH§b>@;

%

S!¦S(>¬ÔAH§b

!

[lSS(>§b

Á[�D@�d

!

U�[\ÈA¾��ØH

!

[

\ÈA¾�?ØH

!

b\ÈA¾ÒÍ

!

a�D@iol

$

»ioµl= §2rs@ô4D

%

S(>0bioBÐ

'

!

1111111111

!

"111# 111.1111

!

111.111.1111

|a?`0�

! (1)

Ø©ÿ!

0

á

1

>D@

!

#�cdeä{0b@;>(\¬ÔAH

@L

%

�¤¾(\��>¬ÔAH§b>@;

%

»S!¦S(>¬ÔAH§b

!

[lSS(>

§bÁ[�D@�d

!

U�[*b\ÈA¾��ØH

!

[*b\ÈA¾�?ØH

!

b\ÈA

¾ÒÍ

!

a�D@iol

$

»ioµl= §2rs@ô4D

%

S(>0bioBÐ

'

nE

$

ÙF

'

!

11111111111

!

111.11111111

!

111.1111.1111

!

"111# 1111.1111

!

"111# 11111111

GH

$

_ãI

'

!

111111111111

!

1111.11111111

!

1111.1111.1111

!

"1111# 1111.1111

)# ,

!"#$%&'()

!

*#+,-./01

Page 7: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

,

$&%#

������� ¡¢��

�XY� �XY�

)=>=̂ ?Z@ )4GY5@

SNC3=N?-@?T=DFCF=>@ *4

]DCaG@T4GD> " "!0

]DCaG@D@EE &02""

S=>>@ND T4GD> "D4>=ZZ5CH=Y5@#

RCDC3G3_=5G@ I##$000

&

R=AC3G3_=5G@ 1111111

&

RCDC3G3P@D9>< "D4>=ZZ5CH=Y5@#

R=AC3G3P@D9>< "D4>=ZZ5CH=Y5@#

*G55T4GD> #

&

L5=DB T4GD> "D4>=ZZ5CH=Y5@#

/H>G=5̂?Z@ )4GY5@

T4GD> " '#(

)=>=P@D9>< %$ YC>

R@=D ""! $!(2"&0 1&#

&

R@FC=D ! ((( !112%

R4F@ 0

*4D.FG55T4GD> "'#'

*G55=Y5@ c[+

MNFCD=5Z4EC>C4D &

)@HC3=5Z5=H@E 0

+>=DF=NF F@QC=>C4D !#1 !$(2$'" #$'

&

+>=DF=NF [NN4N "0 '!12&&( #("

!

"1111# 11111111

r�

$

JKg

'

!

11111111111

!

11111.111111

!

1111.111.1111

!

"1111# 111.1111

!

"1111# 1111111

d�Þä�²�A

!

ÓSdd�¤>AH

'

!

".1111111111 "

¦à¦

#

!

('.111.11111111 "

nE

#

!

('.1111.11111111 "

GH

#

!

('.1111.1111111 "

r�

#

$"!"%"$#

VW>U

ß=DEr�>�-,�iW��+örÍ

WXï~��>Gô

!

àá$Çë¸Õ

%

Ú78

¨©(?@$>�-DE

!

!"ÓiWe7º¦

DE>tu

%

!"iWß=]^�-��

!

�oK

$

�¬K

$

<aK

$

�éD

$

PÛORI

÷ÛØ

!

ËuÕ!"fg!">DE>S(ô

%

©

#.$

¾\�>0��$õ'LM]^>�-

D@

!

\�õ'LMq(¼l

#0 000 "

�þ

#

*

" 000 000 "

äþ

#

û�µØ

%

|LMDE7�p

ã>µÆQLM]^iW.[º¦¸Õ

!

d"Q

S(4N,�

$

µÆmLM�vØ

%

®!"�(

�#LM]åDE7��*>(?µÆÇ>LM

DE

'

!

�oLMK¾®K

!

��LMK¾

1 111 111

û�

"

L¸äþ

#

!

LM]^SEp

"

� K

!

[SLM}¾

#

!

aKORIÛ.<l(\¸|ãT/W>

º¬K

a?DEÔí©«e(\TY\�õ'LM

]å>éNô¸Õ

!

aÓ�òcþ(\�S¯g

høÒ>

$

ÆQ>»Ç/NDE]^

%

ÃW

!

¦

Äý.DE>^�

!

{O@$�-��

!

#iW

*#

2

#

3

,

, - 6 7

,

Page 8: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

P!"¯Þ»ã*.^����>�?.DE>r�

%

aiWúÔ!"(?Z1µ([>�

!

§ÖuÕ!"Qs/=Y4N>DER¬�Þ�S¸Õ>DE

%

<=�-:ouÕ!"|��ÙÚO4NDEWZ

!

ϬM>�ò>FGMN

!

hh£

89:;><=,�TÖ*¬>lm

!

!"�|Ï1>%Ò��Í��

%

$"!"'#

XY£¤

£Y(\�S¬M>ÿ³

$

T±O�<¶DER¬>ï~

!

�òcþ(\gh>

$

([

>

$

S(>

$

=Y4N>DE�«

!

aÓ�òDEh�e

%

Èò��(�d¸>4NôDE

�«>¶�-i

!

!"¤�ýC\�@$>¿À

'

e7!"DE>W�\M.<

!

§Ö�ï

~DEh�*(\�ªiÝ><6

%

(7a?@ADESES

!

�´µgè>DEh�·l

m*ï~R¬-i

$

ÿ³T���

$

T±O�<Ø]\0Ò

%

$"!"'"!#

'(XYZ[\

DEh�>þ«l1£¦\DE¬[�7DE

$

h�DE

$

4��%��Ø

%

a\UV

iWß!"ýqÁY(\ÿ³S¦²]^l²d>À¶

%

!"#iWß=DEÉ0ODE.

7UV

!

#µ¶>DE72<=Q3Ë�7~�DE>r�

%

!"

O¥¦§A¨©��

!"·��|!">DEpã�#S!¦>éL>T�

!

78�ªPb2TÑ�Pb.

7ÿ³��

!

iWgèa?�3>ÿ³��

!

ß!"oV£!">ÿ³@Acþ(\((>

$

,

¨

,#.'

�(>ʨ

%

!

78!"Î5(?�%>

]^

$

�Íÿ��HDE67É01

!

!"·

��(?UV}¾

%

`d

!

òþª¯S(>W

ÿ³¾�«>¿WÄ6

!

�´Ótu|ï~�

>°\��¬íþª¯gè>ÿ³��

%

UV>cþoVµñµ¶>DE0bO§b

!

WXÉgOXvPQ

%

¾e�Y�7

!

((\

'(>`0

!

#.'

l+

%

!

(

ÙF�.��YT~�LZ[�T~

@�

)

!

(

ÙF.UVT~\�LZ[�T~@�

)

!

(

ÙF�.��Y]º\

)

!

(

ÙF�.��YT~�LZ�Zb:

)

!

(

ÙF�.��YT~�LZ[�T~@�LZ�Zb:

)

Wäí©+¶(\�^

!

!"�ò�Zb\�^=¦*+p\�^ä

!

¶ªPÞpãZ

b\�^

!

Á;þªÐÖQ

$

�(>DEëVODEJ&

%

!# ,

!"#$%&'()

!

*#+,-./01

Page 9: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

$"

ª«¬­®§¯��XY

|�²_`�

!

!"�ò�7µ¶T±2ÉÊ>DE0Ó>%&ôO§bÛ�

!

7Çl

$GîO$�^å>DE

%

(7e7a^×Î

!

!"ÓiW£T±DE

$

7pDE2RTD

E:}��

%

78Î5DE§b

$

÷øëV

$

`MDE

!

WXT±>�v

$

D@ØHOÿ!

UìåÓ>~�DE

!

!"oV�ª�2TÑ��gdDE��>.7O¶Å

%

_ÂäS]

^]4>¾SÌæ.7%&0b>]º

!

a?]ºiWuÕ!"[�7~�DE�µ¶�ó

>�òô

!

Ç=>¸oBÐ

'

!

RIÕ§bÛ�

%

!

¦K@L�ò`�ò>��

%

!

`a�v2D@ØH

%

!

æ}05.7ë 

%

$"!"'"$#

'(V]^_

d

#2"2!2"

>`0

!

|e7eµ¶DE>ë 0b1

!

!"�ò(\gh

$

�(>DE,

cÅ-

!

#.!

l+

%

,

$&'#

°oAXY±²<³

´µ9�

!&$

¶X ·9�

#

¸¹

$ %&'

¶X º»�

%&'

¶X ¼½�

'

¶X

ÅÆ

_/̀ T8/̀ "## _/̀ T8/̀ "!# _/̀ T8/̀ "!# _/̀ T8/̀ "!#

¦à¦

" 111 111 1111

nE

(' 111 1111 1111

GH

(' 1111 1111 1111

r�

(' 1111 111 1111

±nÇy>¬ÔAHí¾D@

!

[!"ßnÅÆÂ"¾@ôåÓ

!

½¾S?AH>Gé

¾

0!

xUl�A

!

dnE>�A¾

0"0!

GH>�A¾

0$&"

Ø

%

mn

!

aï)l¾eZ+S

TDEFGBC>ghô

!

Pú*(ÍSTDEh�>BC

!

U�DEh�l(\$Ç%&

kjk>UV

!

��¢XaP¤>BC·L¸$�>þ«BC

%

$"$#

8BFGDE

78£DET�>FG4N

!

!"iWe7¬DE>QRT�OT�0Ó

!

§78£D

E\M>c)O�

!

:(Åú�DEh�>(�

%

0�Ë>MNlò£h�1>DE:}

f��>r�FGO4N

!

9òBУDE:}�-:;{4N

$

�-:¨©X)

$

ÇyÐ

24Ç4N

$

'

"

Üô

$

$M

#

�T4NØ

%

$����DE>�-:r�O�-:r

�<=C\P¤>BC

%

$"$"!#

XYA°¾#12

DE>�-:r�4N9òl#DE>$MåÓ

$

;{�-4N

$

Ð24Ç4NØP¤

ÞW�²

%

"#

2

#

3

,

, - 6 7

,

Page 10: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

$"$"!"!#

`abc

!"

¿ÀÁ�

#.&

l+

!

d�£YÄ8$M

+

>4ÇbD

9"+#!

p|$®iùbD

2"+#!

ߣY

ÿã�D

+

S

9"+# 5

'

+

:

d

2";#8";# "#2"#

,,

 î

+

¾STÓÄ8$M

%

$"

ÂÃÁ�

#.(

l+

!

(\Ä8$M

!

d�Â>ioöKlSþ\2i'"þ¦\

!

a^Ä8$

Mî¾Ù3ÓÄ8$M

%

¨

,#.&

,,

¨

,#.(

$"$"!"$#

deVW>U

U�;{ô�-BÐ

'

!"

ÄÅij=Æ

,

!

aKOÞcRVaK

!

�éD

!

¹D

!

�'D

$"

ÂÃij=Æ

,

!

!

b4éD

!

PÛORIÛ

%"

BÇzÈ,

"#

3ͨ

#.1

l+

!

3ͨl=C�DEcd¦\6RÍ

!

�²6RÍ>4Ç

!

&ZC�$M

## ,

!"#$%&'()

!

*#+,-./01

Page 11: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

lUp|�^T�2~,6RÍ>4Ç0b

%

¨

,#.1

##

)P¨

#."0

l+

!

)P¨lÁ(�'�`µ¶>d/²>2ïL©+>DE4Çtu

%

¨

,#."0

$#

2

#

3

,

, - 6 7

,

Page 12: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

$#

ï¨

#.""

l+

!

ï¨l=ï²>Yþ©+¹�>�Z$Õ+ö

%

¨

,#.""

!#

,

¨

,#."#

#."#

l+

!

e¨l;{cdI>¬

o

!

=f��µ¶I`©M¸Ë

%

%#

)²¨

#."$

l+

!

©+�ªKR|µ¶KL

>tu

!

=�¶�`§²>µ¶§`Ë©+

%

$"$"!"%#

fg>?>U

DEÐ24Ç4N9òle7DE>Ìn

ÜôrÍ

%

µ¶>_`

$

$M

"

dÈo

$

ô5

Ø

#

�>DE4Çioµ¶

%

µ¶^å>DE

Sµ¶>4Ç

!

`d�¨�½Oiw�½|È

o

$

ô5ä>4Çioµ¶

%

ÇySTDE4Ç4NBÐ

'

"#

��4Ç

'

ÈSTÓÄ8$M

+

>Ð2Ï`¾

2"+# 5:

"

#槡"!

@

:

"+:

"

#

#

#

!

#

!, :

d

<+<6

d

"#2##

,,

U� "

!

!

"

!

e0#

¾ÇD

!

 î

+

µ#AD¾ "

!

!>��4Ç

%

#."!

l+

!

}h

%# ,

!"#$%&'()

!

*#+,-./01

Page 13: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

ïTY

+U

"£î

!

�Ö

+

Ù "Þ�

! 2"+#

>KÞo

%

aª«£Y¶4§`>�û

!

m�ûÙ

"Þ�

! +

s|a\�ûä>Ð2Þo

%

}4Çhï>�léYÆ�g

!

�aKl|>éø

!

¾Sç�ô

!

¶ª#aK&'ac$æ

!

öKVW¬[¾

"

"

I$

!

!

"

f$

!

#%

¨

,#."$

¨

,#."!

## ^

'

¤Å

+

µ#RIÆ24Ç

="0! "#! c

µ#

#

#

" >#

!

ÖCr�´�

ª

!

 

?5

$

@EaN>"A@># "#2$#

,,

>4Çd¾ÌÁ`¾

>

>

B

%

#."%

l+

!

}hïTY

;U0

£î

!

m

>

¾V¬ª

!

}

4ÇÓå¼YRIÆ24Ç

!

�£Yfo>

>! B

4ÇHRIÆ24Ç�Ûf¬

!

hïf¾Z<

%

$# 9

'

¤Å

C

µ#

#

#

">

"

#! A

µ#

#

#

">

#

#!

ÖCr�´�ª

!

 îÄ8$M

95

$

@>

"

A@>

#

"#2!#

&#

2

#

3

,

, - 6 7

,

Page 14: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

,,

µ#ÌÁ`¾

">

"

! >

#

#

>

9

%

#."'

l+

!

4Çhïl$£î4Ç

!

§ÖSC

\ÌÁ`

! >

"

7Çî¾40ÌÁ`

! >

#

î¾4�ÌÁ`

%

#}4Ç>ÃbiW�¸

!

}4Ç

¾ShDô\

!

"

9

g9">

#

! >

#

#%

¨

,#."%

,,

¨

,#."'

!#

?P4Ç

'

È

>

\�´�ª>Ä8$M %

"

!

%

#

! -!

%

>

µ#RIÆ24Ç

!

 a

>

\

µ#RIÆ24Ç>Ä8$M><POcd(\.>Ä8$M

!

U4Çëìd¾?P4Ç

%

#."&

l+

!

?P4Ç|(zþB

!

3Æ÷2

!

Äý

>

>¦¬

!

?P4Ç+±YÆ24Ç

!

�Ö/Æ"iP/XF

!

4Çï»ÞËÞZñ

%

#¨�#iW�¸?PKílÆK

!

�Ö?

P4Çhï�>¤ùíl

"%

¨

,#."&

ÇyÙ3DE4Ç4NBÐ

'

DÉb4Ç

'

|

>

L@ND4G55C

�$�

! (

,�

D

¸�

E

)

a(Ä8¹º>öKXUÐ

2

%

#."(

l+

!

DÉ4Ç>IJö Y &O

>!

U� &l°�

L@ND4G55C

�$�,�

D

¸

'# ,

!"#$%&'()

!

*#+,-./01

Page 15: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

�>Ð2

! 2"+#

¾,�

D

¸�

E

�>Ð2

!

}¨I>�l|

FU>

%

m &

U02%

ª

!

¨I

l£î>

%

m

>

¦¬*"i¬ª

!

)ò &µÝ±

0

O

"!

DÉ4DZ¼YÆ24Ç

%

S!4Ç

'

|

>

L@ND4G55C

�$�

!

�$

E

�PÚ*+(�d¸>Ð2

%

#."1

l+

%

¨

,#."(

,,

¨

,#."1

LS!4Ç

'

�-:ä(^Ù3Ð24Ç

!

;{eÁSþ\�º�#ö

>

\�º

!

#¸KÅ^å>�º>�D

"

µ�#

#%

#.#0

l+

!

m

>

+Y"iª

!

ÓiW=DÉb

4DZ¼;{KÅ^å�±>\D

%

¨

,#.#0

j�4Ç

'

Ä8$M

C

lSioöK>K¾

0! "! #! -!

�ö]\K>Ð2¾

G0C5E1 5

'

E

@

:

'

E,

!,E50!"!#!- "#2%#

,,

U� '

e0

lÇD

!

 î $¾µ#AD '>j�4Ç

%

#.#"

l+

!

m

>

º¬

H

ºo

ª

!

}4Çi=YDÉ4Ç>±¼-R

%

}4ÇÓ�Y;{(éªûBÄ8¹º�Ö>�D

%

STDE©'

"

Üô

$

$M

#

>�T4N

!

Ay+

$

%

(

rô`a

)%

(#

2

#

3

,

, - 6 7

,

Page 16: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

¨

,#.#"

$"$"$#

°¾#12ST

|§È>89:;<=���

!

!"¿¤e!¦}~>]^µ¶><=

!

U�|�

:ÍÈv��

!

!"&�8gh>89:;<=��

!

��o�:ÍÈ��

!

'î¾

hR̀ + "hD>@55C9@D>R@FCH=5̀ @E@=NH< +?E>@3# %

ÂBêe#~�DE>FGô4N*4$D

E>9~ô`ö

!

³*89:;>��4N

!

WX¬M<=]^�-:PQ£89:;

,�:}$%Ø]\0Ò

!

l(\IfÀÓ>}~89:;<=_`

"

÷y+

%

%

# %

$��#$Ò&'

!

ß=}��>!¦¸o0�N¾]%>67_`

!

U�+

'

%¯S

£}��Ifç�O÷ø>��O��

%

kÄ>tu�

!

!"|º¦�PW

hR̀ +

�>

<=_`¾ìl

%

�-4N4¾�-;{O�-�ZC­4

%

�-;{l�-�Z>@A

!

l78X)�

-¨©O-RDE4Çr�>@$�-MËe74$�²K>4Nr�

!

¾:(Å>�-�

Z~�@A

%

�-;{9òBÐX)4$DE>êD4Ç©OêD4Ç)P¨

!

-R4$D

E>�¬K

$

�oK

$

aK

$

RIPÛ

$

�éD

$

$��DOz4éDØ

%

iW78�¤>`0ËÄÎWä�-;{ST�-M>ÐÑ

%

78

hR̀ + (

�-0��

)

>

(

;{�-

)

0�Ú*4$DE

!

#.##

l+

!

vw�½`aæ]üÕô«mw�

!

Ú

*a?w��Ê1G�>xy[z>Õ$K

!

§Öl�Ê1

%

ÙBG�>Õ$K

%

Ú*DE

'©�

(

¨$,�

)

'

! (

¨$,�

)

$MÓl$�ò�-;{>4$

%

n1|

hR̀ +

�£¨

#.##

�>

(

xy[z>¨$,�

)

$M:}�-;{

!

Í#¨�>

(

�(Å

)

.n

!

n1Í#

(

�ÊG�DE4N

)

.n

!

Ú*�-;{,�

!

B�-MK>

"

¨

#.#$#$

êD4Ç©

"

¨

#.#!#

OêD4Ç)P¨

"

¨

#.#%#%

¨

#.#$

'©Bl]\@$�-M>K

!

BÐç�+ö>;{OÙ3Q`>;{

%

ç�+ö>9ò�-KRSaKO�éD

!

a?KR»î¾éø`MKR

%

!

(

�éD

)'

STÓ4$DE.DK¬oK'

!

éYé��Í>DE��éD

%

!

(

aK

)!

(

RVaK

)'

ØYlS4$K/OEW4$\D

!

=Y<=4$DE>

<a.<

%

)$ ,

!"#$%&'()

!

*#+,-./01

Page 17: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

¨

,#.##

¨

,#.#$

,,

¨

,#.#!

*$

2

#

3

,

, - 6 7

,

Page 18: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

aKO�éD>T�

'

d�DE3£î4Ç

!

�´DE>aKO�éD0±

*

d�DE

¨

,#.#%

3Ö÷4Ç

!

 aKoY�éD

!

È3×÷

2

!

 aK¬Y�éD

%

lW

!

iWIfCr

¬oËhÅ4NDE4Ç>£îô

%

Ù3Q`>9ò�-KRSxÛ

$

$

RIÛ

$

$��DØ

%

!

(

�¬K

)

O

(

�oK

)'

STÓ4$

DE.DK¬oK'1>�¬KO�

oK

%

!

(

)!

»î¾

(

Ô<

)'

lSTÓ4

$DE>�¬KH�oK/Û

!

<=

DE$æ>VW

!

X)êD4Ç©ª

!

ÁÔ<Ë Å�LDO�<

%

!

(

)'

;{(\$MlS>�²K

HaK><aÙ3Q`>KR

%

Þ¬

!

DE>Ù3Q`Þ¬

%

!

(

RIÛ

)'

;{(\$MlS>�²

KHaK><aÙ3Q`>KR

%

R

IÛlPÛ>RV<PÃ

!

£Y-M

(�>$M

!

RIÛÞ¬

!

DE>Ù3Q`Þ¬

%

!

(

$��D

)'

(\`M�£Ù3Q`>KR

!

ùSMo

%

$��Dóî¾Ù3�D

!

l]\$�KRHURV<aK>IK

%

Id

'

xÛHU<aK>Iî¾xÛ$��

D

!

RIÛHaK>Iî¾RIÛ�D

%

lW$��DiW=ËIfS\Moµ¶>

$M/û>Ù3Q`>Û�

!

»iW=ËIfMo�¶[<aK�Ûps>S\$M

/û>Ù3Q`>Û�

%

$��DKެ

!

Ù3Q`Þ¬

%

!

(

4éD

)'

�Y�¬KO�oK/û>(\DK

!

ßÚ$M>(­4�²KoY2Ø

Ya\D

!

Ã(­4�²K¬Y2ØYa\D

%

C\4éD/ÛiW<=�²K>Ù

3Q`

%

�Ç=>4éDlz4éD

%

Id

! (

z4/p4éD

)

l

02"#%!

 $M>

%b

>�²KoY2ØY

02"#%!

$M>

1%b

>�²K¬Y

02"#%%

�Ç=>z4éD

lz4/p4éD

$

z4/D{p4éD

$

z4/p{4éD

$

z4/q{p4éD

Oz4/r{p4éD

%

!

(

êD

)

K�²K¸�>�D

%

¾e74$��²K>4ÇëìO�Y�-M-R

!

i

WX)êD4Ç©

%

êD4Ç©4¾Ù3ÓDK$MRTêD4Ç©OSTÓDK$

MRTêD4Ç©

%

Ù3ÓDK$MRTêD4Ç©X)PQ

'

W$M>µ¶öK:}4�

!

§45'¸]

!$ ,

!"#$%&'()

!

*#+,-./01

Page 19: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

�l£<>êD

*

]�>ê2l]�>êDEW~êD

*

]�>ú-êDOú-ê2al}

�>/�ú-

%

STÓDK$MRTêD4Ç©X)PQ

'

!

�Ô<

'

�xÛ

!

�¬KH�oK/Û

%

!

Q�LO�<

'

(¼Å

(

á

"$

\�L

!

]�L>ÐÍO×Í45î¾�þOäþ

*

�sC\�L>�þ/Ûî¾�<

!

Ç=Ô<>

"6"0

öh1N¾�<

*

��L>��

Kl

"

�þ

f

äþ

#6#%

ȋ

'

+(�L<B�oK

!

�t�L<BÐ�¬K

%

!

'¸êD©

'

��'DEu~

!

Ú¸]�L>êD

!

�¬YØY]�L>�þ§Öo

Y]�L>äþ>�²K>`D

*

Ú¸]�L>ú-êD

$

ê2Oú-ê2

!

d

¨

#.#!

l+

%

!

X)êD4Ç)P¨

'

ÓlW4�$M¾1�

!

WêD¾d�

!

W)PI>�`Ë©

+�D4Ç>¨I

!

#.#%

l+

%

$"$"%#

Á�x?zde

|DE>��FGH4N/Z

!

hh�ò£¦_`>$M/û>�´T�:}FGO4

N

%

!"×:

!

|%&>

$

�_>

$

$ïô>

$

BЬMÀÁ�z>�����

!

�_>$

M/û>�´T�»ljk¦4

$

v|%&>

%

Id

!

C\$M/ûiolïô�T>

"

�T

#!

»iolïôµ�T>

"

ïô �T

#!

»iol$ïô�T>

"

��T

#!

»io

l$ïôµ�T>

"

$ïô �T

#!

#Siol$ïô*�T>

"

$ïô<�T

#%

£Yï

ôO$ïô��T˪

!

#S�T>ðw/4

%

G0

!

!"0F�(�89:;�>(¼ô>ïôO$ïô��T>ðw�7O4N

%

¾e�Y�7

!

!"

(

Ô=

)

)ïOhï>©MPb˪«

!

[;ѧ$Kïô�T¨+O

$ïô�T¨+

%

!"

ÉÊx?z

,

�)Y

+

>w�Tô

!

#.#'

#.#&

l+

!

£Y$M

,

˪

!

|Ußc>K�V

WB

!

$M

+

|º¬VWB>$Õ)luÐ

,

>¸o$Õ

!

!"ª

,

�)Y

+

dw�Tô

%

<

8˪

!

£Y$M

+!

|$M

,

ßc>K�VWB

!

$M

,

|ºoVWB>$ÕÓuÐ

+

>*

¬$Õ

!

!"ª

+

�)Y

,

dð�Tô

%

;ª>�Tô>ðwlSP/ô>

%

¨

,#.#'

,,

¨

,#.#&

"$

2

#

3

,

, - 6 7

,

Page 20: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

$"

Á�px?

#.#(

l+

!

d�"�

+

$Md!$Õ

! ,

$Mí·|

..! //

�ûBÄ8$Õ

!

 

ª«

,

H

+

iod �T>T�

!

.

(

,

(

/%

!"�²(\_`

%

|(\���

!

!"®Ú>DE

+$ ,

>T�d¨

#.#1

l+

'

¨

,#.#(

,,

¨

,#.#1

,

¨

,#.$0

d�®M+[\$M

-

>DE

!

§H

+$ ,

;X

!

#.$0

l+

%

,U2

"

"+! -

"

# U2

D

"+! -

>

#!

IdH

?

�<}>(

\<¤

!

Ólª"�

-

ö!K

!

»µlm

,U2"+#

>

bDT�

!

-

H

,

>T�d¨

#.$"

l+

%

 ª«

-

H

,

 �T

"

µ�T

#!

=��ñ>Ð

Ñ©MÓl

! I", +# UI", +! -#!

$ÒÏ1�·

:}÷ø7Å

%

%"

Á�Ëx?

#.$#

l+

!

m�$M

,

H

+

þª|(èÊ?Å6R��:}�²

!

��Äý

+

$M

>$Õ

! ,

$M3�¸VWßc>"3>Ä8$Õ

!

 ª«

,

H

+

iod$M*�T>T�

%

mn

!

a^T�ºr=IQ>¨+©M

%

¨

,#.$"

,,

¨

,#.$#

$M*�Tl89:;�º�ò>(\ÐÑ

!

!"7Ç�a^T��7¾Æ®T�

$

À

xT�

!

2rªlÀÁT�

%

a^T�>p|

!

hh·lm!"£ÊR$M-®>IQ`

!

»·Æ®!"þª¦$M>D:0Ó

%

�¤(`ª«$Mû>a^�´T�

%

(\���S

+$ ,$ -

[\$M

!

È

+$ ,

>DET�d¨

#.#1

l+

%

®M+[\$M

-

>DE

!

§H

+! ,

G¶;X

!

dd¨

#.$$

#.$!

>T�

%

#$ ,

!"#$%&'()

!

*#+,-./01

Page 21: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

¨

,#.$$

,,

¨

,#.$!

#.$$

l+

! ,U2"+! -#

!

»Ólª

+$ ,$ -

[\$MiWcþ�\ïôD:0

Ó

!

 ª«

-

H

+$ ,

C\$Md��T>T�

%

#.$!

l+

!

,U2"+! -#

µdª

!

»Ólª

+$ ,$ -

[\$Mµocþ�\D:

%

+

H

-

>T�d¨

#.$%

l+

%

,

H

-

>T�d¨

#.$'

l+

%

¨

,#.$%

,,

¨

,#.$'

±n;ª

+

H

,

>T�µ$

!

#.#1

l+

%

[

,U2"+! -#

µdª

!

»Ólª

! 2"+! ,!

-#

µi;{

!

µoþªD:0Ó

!

 

-

H

,

io*�T

%

d�=��ñ

I

©+>Ô

!

�=ñ

ÐÑ©MÓl

' I", +# :I", +! -#%

U�

! I", +#

©+|

+

>Zú�

,

>µQÅô>¬

o

! I", +! -#

©+|

+

X

-

>Zú�

A

>µQÅô>¬o

%

(¼tu�

! I", +# eUI",

+! -#!

»Ólª|Â×

+

��>@Aä

!

k×:e

-

��

!

ßÚe7

,

��>µQÅôI0

Zoe

%

¹�ä

!

d�

I", +# :I", +! -#!

 ª«

-

ºiol

,

>Æ®½0

!

-

H

,

*

�T

"-

l

,

>yf$M

#!

�u�

-

1

I", +#

$¬e

!

»Ólª

,

>µQÅô¦¬e

%

`d¨e7z¾pI{

!

787ªÒe@7ª

"+

��

#!

!"e7*(\

/

|õÍp>

tu

",

��

#!

7ªÒľ}&&~ÃÆ

!

[!"»µogÔQÅ&~lÃÆ>

%

[;ª

!

!"k#�ä�*(é�á

L

|>p�

"

!"µ×:l

L

|>�ár

#

|��äª

"-

��

#

}&÷�

/

|

!

I", +# :I", +! -#%

!"�0õÚ>

/

|õÍplU&~ÃÆ>�

�$Ú¯µQÅe

%

³Id

!

!"|�ßz)zª

!

&'�*7ªÒ4�>7ª

"+#!

nûßz�AâË(L&g

"-#!

ßÚ7ª

"+#

�µ45e

%

! I"+# :I"+ -#%

 ª

«

-

H

+

iol*�T>T�

%

$$

2

#

3

,

, - 6 7

,

Page 22: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

'"

Á�:AºÌÍT

d�����SC\$M

+$ ,!

®M1>DET�d¨

#.#1! ,U2"+# UE+f/%

;ª#�

�W.�+[\$M

-!

ß���.Ä}

!

n1®M

+$ ,$ -

>DE

! ,U2"+! -#

iol

¨

#.$0!

¨

#.$$!

¨

#.$!

�>(^

%

!

!":}:(ÅÈÉ

!

u�e

-

1

+

H

,

>T�

io¸�[^tu

'

"# +

H

,

>T�ùS$Õd¨

#.#1!

ª«

-

H

+

ùS�´N=

%

## +

H

,

>�´�)T�&$e

!

d

,

£

+

>�)T�Þðe

"

¨

#.$&#

2

,

£

+

>�

)T�ýwe

"

¨

#.$(#%

¨

,#.$&

,,

¨

,#.$(

[

,U2"+#

>D:0Óldª>

!

ª«

-

H

+

£Y

,

SN=

!

�Öl�TN=

!

�S3>

�´N=

"

�Ø�-:ÇÇy*

#%

,

¨

,#.$1

$# +

H

,

>T�&$e

!

§Ö

,U2"+#

µ³dª

!

ª«

-

H

+

O

,

SÀÁN=

!

»Ól*�TN=

!

�"3>ƮN=

%

#.$1

l+

%

Iäl{

!

$M>�´T�~,d�

'

!

ïô

6

$ïôw�T

!

ïô

6

}ôð�T

"

��T

#

S3½�T�

!

ïô

6

$ïôµ�T 809  3T�X�$½�T�»

$ÀÁT�

!

$ïô*�T

"

<�T

#

809 "3>ÀÁT�

!"iW�*

!

èloþªD:T�0Ó>$MT�ílSëì>T�

!

lS3>

!

l

û>

%

èlµoc²D:0Ó>$MT�iolùSëì>

!

l"3>

!

lµû>

%

»Ól

ª

!

D:lû>Í:

%

$"%#

8BHI

äÒ!"��ed!#DE>~�T�

$

DE>UV©MODE>D:r�ØS\P¤

Ëe7DE

%

|£DESefÔ¤���>e7/1

!

!"�ò¾W89:;>��¾ÊR

`öÓm>DEe

%

d!#89:;Î`*�DE>`ö�

&

!"<m�âÓm>DEë0

ODE>Ø©ô

!

n1³Í:�:}DE>`ö

%

%$ ,

!"#$%&'()

!

*#+,-./01

Page 23: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

$"%"!#

ÎÏAXYO�

DE=Y4N>ë0l³´

&

l£~�:}4N#l£4$:}4N

&

!"0�(�~

�O4$>ÅÆ

%

ÐÑ

'

õö��>Ô�£z

!

»iWªlòÈÉ>l£z>Ô�

%

ÒÓ

'

~�>(\0ç

!

�Ö�Ml(\¾SØ©ô>0ç

%

#4$��

!

W�£

h\~��?,�

%

�-:>(\þ«*Yl7Ç78qM4$�®~�>�(\2¦\_`2Üô>r�

%

4$>Ê>(¼l=Ë�®~�>

!

(��lµl�e

!

§µ�òh\��[P×:

!

9(�ÓiWe

%

�89:;>(\þ«*Yl78�M¬>DEçàál~�$üË;X

~�

!

§ioÃE;Xϸ££Ë>-®

!

2jÞlm

"

�MÆ-

#

ËM*mn>,�

!

a

l89:;MQ¯UnjZ>P/

%

��ä>89:;l;XO-®

!

��¶~�>ÉÊh

hl

(

;X

I

I

lm

)

>ð0

%

[l

!

¬�áâ

!

]^]4>$Õ½ólmý!"ò4N>DE

'

2|$M>lm

$

$

�"lµ|

$

\�Û�>lm

$

_Â>ÆÇkæ

$

ùL>ªû$Õ

$

Øó>]�lmØ

%

!

"·=@YD:>89:;M¾ËÑ�a?æ2$Õ�>¬MDE

%

¹�ä

!

ÈYòÞð!

"£MN

$

Ö¢�l¡*>¬DE2¬��ϸ��;X2-®>o_

!

ÚÚ78ú�O&

:89:;>RQlµV>

%

|89:;>�²¶~<=�

!

Sd¦tu��ò£¬DE:

}Í:>ò`O#4

!

�µl£¬DE$ü)0<=89:;RQ

!

aïSº¦�½

!

`d

'

!

£¬DEÔç:}89:;ªû§

$

d$�

%

!

¬DEÔç>DE\MµV�

!

À&d4¦

!

)0lmÙÚ(�

%

!

¬DEÔç>9Õr�µv4���5

!

�òú�1ÙÚ

%

!

¶~<=ä�òXª

"

�ª

#

Ú*ÙÚ,�><�OK.

!

�òú�89:;>ôo

O(2

%

½;

!

`öoØ©¬DEÔçÀÓr�>4$DEd¾�?89:;¶~<=>0 ÿ

%

!"DE`ö>� l

!

|`ö>DEoV¾W©M¬DEç>9òr�>tu�

!

ioý¾¶~��£89:;ôo>ò�

%

$"%"$#

XYA~,z

G0

!

!"ò�â>l

!

µ�4$l¬>#lo>

!

"�l³´4NûL

!

ò»ã>l

=Y4N>4$lUoVØ©~�

%

Id!"�|Ú*�^fq>vw>ÈÆ_`

!

ÈÉr

ß=a?_`ËØ©lS>iS}vw>�½

!

N¾!"ÈÉ}vw>4$DE

!

�²äÂ

hhlS÷ø>

!

�§µlÖQãÆä>4$

!

l#¬M}vw>_`�Ä8`ö(?¾S

Ø©ô>_`

%

&$

2

#

3

,

, - 6 7

,

Page 24: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

$"%"$"!#

'(hi

DE>Ø©ôlDEi�ô>(\P¤

!

ùSØ©ô>DEmn»lµi�>

%

!"Ç

y>lmi�ô>(\�½l#öS÷

%

Çy>#öS÷>4$

!

(^lÌ�ô¤<

!

d`

"*

Ã(^lP�#4

!

d`

#%

`

"'

�8ó�>Ûf

, "

Ì�ô¤<

#%

!"»ã*f�DElˬYôã>f�

!

ÃE�²89:;>}¾�$

!

£ó�ýã

`µ�>ôã¯Cv�Çf�

%

�Çf�l�òCVªûOÖ_[gd>

!

d�µñ*ÿ!

�1>�.

!

ÛfDÊ<}¬YÒf

%

lW

!

£YfJ¶±�A}DE·S÷

%

`

#'

§|�0ä¤>ílÒ�0

"

P�#4

#!

#.!0

l+

%

³d

!

(?�ä¤íl

��

!

�¤�µy>ílÖ�

%

¨

,#.!0

Ì�¤<

'

Á£�\<�>Ìn¤<Id

%

S�zy>

!

If·µ���[¤<

!

`d

!

[^<>·I[©�>¦Ú¦

%

P�#4

'

4$þY~��vY#*>(­4

%

Id#�0ïÀ¯�

!

,À*>l<<

t`�>¯�

%

Â>EÍlDES÷

!

µ¾Ø©ô

%

dô­�

!

7Çl��ä¤>­�Ë&Zh�­�

>Òª

%

$"%"$"$#

'(jk

!"Çy>lmi�ô>�½

!

#SÆ®

%

#�ò»ã>l�çDE>8QlUTÖe

£�®ÊR>Æ®

%

`d

!

w�>«�-U£Ø(>Æ®

!

«�-UÛ>w�I«�-UÒ

>w�SfÛ>Ø(

%

³d

!

ó�Âlñ©�

!

ñ©£z>W©£ñ©ÊR>Æ®

!

�SI

fOè2��>W©>Íÿ¯Cv,ñ©*

%

'$ ,

!"#$%&'()

!

*#+,-./01

Page 25: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

$"%"$"%#

'(il

!"Çy>lmi�ô>�½

!

#S÷ø

%

`d`a÷ø

"E@5@H>C4D YC=E#!

ÁY`�>

ÈÉ£zH£`�>ÈÉ£z|�?r�äp|Û��uÐ>QÛ

%

a^÷øÇ�ÖYDE

4N>Å-KL

!

lKµ¶åÓ>ÈÉ£z

!

DE�`>8·µ¶

%

`d

!

"#M�(<

!

ÂKÌ~wÈÉ��²*M�~\�2f(¼�½¾Z>�z

%

alÁYS��vw2ES

>�µo#¹�?Ì~l[

!

dµ�âa((<

!

��M�\�2H(¼�½\�2�Il

µ�Ó>

!

l`a÷ø>(^

%

ÃW(^÷øl��÷ø

!

kî�²÷ø

!

K|�çh�RTKLÁY�²O®MPQ

äSESTÖ>DE÷ø

%

`d

!

½}w:ÍÈ�>ñ©÷øioËÌYñ©£zXñ©r

�P

%

w`�O£/�>ñ©01H²ºµ¶

!

2rñ©UVH\Mµ�

!

WX�9ÅJ>

¸ÕØaiTÖñ©÷ø

%

$"%"%#

XYA�b

O4`ö4$DEPo�Ò�Ø©ò4N>~�

&

(^PQlÄ8#4

!

Ã(^PQl

~�#ö

%

$"%"%"!#

m!no

!"µt�ghݯP×:�lÞ>

,

#4>Ö�Ól#(­4ËÚ×Ô�

%

`añ©

,

¨

,#.!"

£z>(­4�:}ÈÉ

!

`aa­4�§µl

½¾£ì"r5zåA

!

�l½¾ì"¾SØ

©ô

%

³´4>4$iWØ©~�

&

G0

!

!"�

(�¨

#.!"!

DEú�rODE#4r

%

!��

Yzd�

!

DEú�rÓl¶�

!

DE#4rl

Íÿ

%

¶�·�Mpo>

!

Íÿ·�M¿¬>

%

ó� �>�"QØ©h�ï>�

!

#.!0

l

+

!

C\ó� 45l¬�Oo�

!

aµoØ©

h�ï>�

%

Ã<>PQl

!

|�0ïÄ8¿`

!

U,�ºiolS¬So

%

aï>Ä8µlÄ�

!

Ä8>ã*lh\�0

"

»Ól�>~�

#

ï°

(\�íSio,`�

!

»Ól8·aØ

%

Ä8

#4µ!¿¡¢£

!

®°\4$aS`�>8·

!

�Ö8·�Ø

%

`dÄ8D@OÄ8D@©

!

µ

¶éø¾S�ªô

%

»Ólª

!

×:e©>�(­4l³´D@

!

µ·ú�ÿ!TYUì­

4l³´D@>��

%

($

2

#

3

,

, - 6 7

,

Page 26: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

Ä8#4>� l@=µ¤¢�¾`a>8¡Ë`ö4$

!

p°\\�¶4>�`8·

ËCE÷Û

!

#.!#

l+

!

Ä84$Qs>l�¾`a�Ë>÷Û

%

¨

,#.!#

Ä84$iCE

(

÷«

)%

¶(~��%#ö!¦¬o(4>Ä84$

!

lS4$>$�

JuÓ·ïð�^iW-®>I2

!

#.!$

l+

%

¨

,#.!$

$"%"%"$#

ilZ`B

=4$g-~�

!

tn·¡*÷øO$�

%

ÔÕ

"YC=E#

lK4$£~�WK>÷Ù

!

B

ЮM�9>µI

$

4$8o

$

:$Å-µ��

$

4724�µaO

$

#4£Ä8

$

®Mr

S9��/Ø

%

Áf

"Q=NC=YC5C>?#

lK|(\~��

!

°\\�|�TÜôä©�¸>Û�

%

#(\~�#ö>4$

!

�ßlÄ84$»·S÷øO$�

%

#$\ä�7

!

÷øl1Ù²

d>

!

�$�l0ÙId>

!

[Dra·£g-~�r�>�-4N²dlm

%

#4QÛl²d÷ø>�ÁG>(^

!

QÛâþÓlÂ>`M

!

!"iW`aÄ8#4

Ëc)#4QÛ

%

#4QÛl#4a\}æ.[>QÛ

!

ß=e¥¦>#4PQ

!

Id�

¤<

*

VðµÔ

!

»Ól§�e�?\�

!

d¬Ô·¸Ó·§�ù¨¬Ô>�

!

³d�©©

©·§�ÇÇW¸>�

%

Ee#4QÛW

!

²dDE÷ø>#SÄ8QÛO$#4QÛ

%

l

�Ä8QÛl`ö4$ª½¾8·²d>4$�-MO~�AD>Û<

%

�$#4QÛlK

O#4"T>QÛ

!

d

'

®M÷ø

$

�.÷ø

$

]ªPQ

$

¤<QÛØ

%

!"³Ë�DE>$�

%

$�l�->Zú²º

!

S$�PS�-

!

ùS$�»ÓùS

�->tòe

%

#4H$�SýÏ>T�

%

`d

!

�²#4hh)#ö(�

!

lW#¬>Ä

84$R¸>g-K

!

S|·Ý±WÆK

%

#(\Ä84$lÚ*>�-M>$�ô

!

ñÄ84$M>lm

!

§µñ~�¬olm

"

)ò~�áqI4$¬¸¾V>OD�i

#%

½

¾

!

d�Ä8#ö>4$Mo

!

 4$\�û>Û�ôjÚ¯Þ«j

!

</ÄýÄ8#ö>

)% ,

!"#$%&'()

!

*#+,-./01

Page 27: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

4$M>µZ¦Þ

!

DEÓ»+/YÆ24Ç

!

¬¦D4$û>Û�ôjÚÞËÞo

%

jn

!

(\Ò>4$<}l�Mo>÷øO�MZ>$�

%

�<>�PQl

'

@=Ä8#4þZ

÷ø

!

#ö¬4$ËþZ$�

%

,

¨

,#.!!

$"%"%"%#

pqrs

4$ùS«Q;<!"ST~�>IQ��

%

!"(¼

Ï>l!4$��Z>��7?¾~�>g-K

%

AD

"S=.

N=3@>@N#

;{~�>D@

!

!"�²"Q×:AD>K

%

-M

"+>=>CE>CH#

;{4$>D@

%

#.!!

l+

!

(7ö

e4$

!

�-M»Ó×:e

%

$"%"%"'#

rsn6

#4><¤l©©

!

(\�©©©O~�>`0

%

©©©ª

!

!h\�©~�N¾4NÊR

!

Un!~�N¾4$:}4N

%

[|�²�©©

©ª

!

~·§�(?�

%

mn|¬DEªØWZ

!

#¿�Î`�

!

#4¯�R(?

%

[l

!

Ö¢|¬DEªØ

!

~�§µlin�µiX>e

%

©©lï¨!h\~�µ�ñ©

!

[)

0ÈÉ~�Sd¦EÍ

'

!

~�8¬

!

ðD�

%

aºCv�7

!

|;"�(`e

%

!

CvS¤

!

¶4»io·!µl}~�>BÐU�

!

�Qµ

%

!

|&'ÈÉ>ª�~�#µp|

%

Idß=.°

!

d�!lSß=}.°>�íR~

�>Ô

!

|&'>ª�~�#µp|

!

�Ö~�·Äýªû�ÞËÞ¬

!

!"ºr�

ç­ì"

%

!

"Q´©ªôñ©

%

Id®®¯lµlm

!

)SÍ°eÂP×:

*

Po±·µ·Z

!

)S7ä¬1�²ÂlUZeØØ

%

!

õÚ,�>ªûIf§

%

aºCv�7

%

$"'#

8BJK

¶~89:;|<=RQWZ

!

�ò£DE:}¬MÑ�MN

!

W�¾�<RQ>d¸

�jú�DEIJ

%

a(Å£89:;>,�Sý$Ç�ò>lm

%

Ç=>89:;-Ñ�

PQ9òBÐ

'

!

XY(Ö

"

=('2r¦'ÃE�?ë Öd.DE

%

!

XY×=

"

�°ÙÚ>DE4¾C�2¦�

!

(�=Y²·0Ó

!

ÃW(�=Y®:

DE

%

!

XY�

"

�DE:}\Mc)

!

�[E(?l�>mDE

%

!

XYÙÐ

"

7Ç-RDE>~O

$

<aK

$

-D��

%

!

XY3ÚÛ

"

¶I`�¯&DE>KW�ý¾ò�

!

dò�|VW

" I"20 gf"20#

*%

2

#

3

,

, - 6 7

,

Page 28: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

$

�o

I

�¬ëVÕ

$ i.EH4N@

ëVÕ

$

oDÅRëVÕØ

%

!

ÜÝ���

"

³E

$

´6SEpK>DE

!

<=ÇM

$

aK˵?EpK

!

ûæ¶Þ

µ¶EpK

!

<=-®K˵?EpKØ

%

!

XYÂÃÛ

"

d4�

"LCDDCD9#$

Øêi4

$

�i4

$

)P¨4N

$

@Yñ>Ù3

ÕØ

%

!

ÞßXYàÂá½��

"

<=(?'(>D:PQ2ß=�Ç,®

$

,å4NØRQ

Ñ��ÇDE

%

!

XYâÛ

"

=�.<DEöØZ.<DE

!

`d=

(

·_

)

KöØ�^'>

(

¸:

)

%

�¤

!

!"��Í��DERIÕODEÙ3ÕP¤>BC

%

$"'"!#

XY3ÚÛ

ÁYµ¶$MÇǾSµ¶>(éOµ¶>$�Q`

!

µ¶>(éÇß�D>�²7Å

�Ö­r

%

`d

'

+(\$M>(él

B9!

+D\$M>(él

H3!

�´|-RG£<Ùª

�¸��C\¹`�+(\$M�²K/Û>G£K

"

(él

B9#

H+D\$M�²K/Û

>G£K

"

(él

H3#

�Þ>tu

%

ß=r·ª

%B9

>Û�O´iWH

$H3

>Û��Þ

&

µ

¶$MÌü¾S�Ûf¬>$�ª

!

·ß|-R¸>T��D�µ¶$MlÙ>I��Ûº

¬

%

`d

!

+(\$M

"

C.¹±^Sü�>BºêM

#

>DK|

#b

*

!b

!

�+D\

$M

"

C.¹±^>»TM

#

>DKVWí|

"000

H

%000

%

¾eCEMolmO$M

Ìü$�¬o£DK¬o>lm

!

¼�DERIÕ

%

$"'"!"!#

`atuvwx

ÙÛRIÕl�$M�>�²Ký[}$M>�oK

!

n1EW}$M>xÛ

!

'

+

JE

5

+

JE

:3CD"+

E

#

K

E

"#2'#

,,

¿8ÙÛRIÕ1

!

]^$M>�²K>DKVWí�|

20! "3

!

§Ö¿RIÕ

>DEílùS(é>�DM

%

ÙÛRIÕlCEMo

"

#

lmO$�¬o½ó>lm

>�'(>PQ

%

S(?T��D

"

`dG£KKDÂ`

#

|ÅƪÓ¿ò�£DE:}

ÙÛRIÕ

!

[S?T��D>-RÃbJùSa4ò�

!

m`=aåT��DZ

!

µ½0

£DE:}RIÕ

!

��4N>,�lU¾SãÆ>$Õ

%

$"'"!"$#

`avwuvwx

RIÛRIÕl��$M�>�²Ký[}$M><aK

!

n1EW}$M>RIÛ

!

'

+

JE

5

+

JE

:+

E

L

E

"#2&#

,,

¿8RIÛRIÕ1

!

]$M�S¥(o�²K>DKoY

0!

Ã(o�²K>DK¬Y

0!

$M><aK¾

0!

RIÛ¾

"%

¿RIÕ>DEílùS(é>�DM

%

£$M:}>R

!% ,

!"#$%&'()

!

*#+,-./01

Page 29: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

IÛRIÕiWCEMo

"

#

lmO$MÌü$�>lm

%

[S�ľ¿8a^RIÕ

1

!

�ËDKf¬>�²K£4å,�>lmßnÙ«j>õö

!

<}:(ÅCE¬o½0

>lm

%

��d;

!

Â#lmZ=Ú�¦>DERIÕPQ

%

$"'"$#

XYÂÃÛ

DEÙ3ÕlK�±ý�D�>DEi4¾�û

!

|89:;>8Q�¾S�ò>N=

'

!

Ù3Õ,��·ýqpÅST$MK>\D

!

ýqO'Õ�Ë>DE

%

!

Ù3$M�£YST$M˪¯0±Y×ÎE¤>©+

%

!

(?RQ)o<=YÙ3ÓDE

!

ßÚÙ3ÕÑ�d¾tò

!

�Ù3Õkߺ¦RQ

><=VWYZe

%

$"'"$"!#

tyxfz

ST>$MÙ3ÕÓl�¾�ô>¸Õ#z¾ÐÐô>¸Õ

!

��öK>ST�ûi4

¾o>�û

!

³�°\o�û�.Åƾ4(>öK

%

`d

!

:Ö�:,-1Sed¾

!

!

"iWÃEd¾p¸i4C\�û

! .0! '0/

¾µX§

! .'0! "00/

¾X§

% '0

lC\�û

>4âÍ

!

î¾ZÍ

%

ZÍÓlo�û>i4Í

!

�û>(­4DEoYZÍK

!

Ã(­4

DE ¬YØYZÍK

%

`öZÍ>PQµ¶

!

ÓTÖeµ¶>Ù3ÕPQ

%

$"'"$"$#

tyx{|}~

£ST$M:}Ù3ÕÑ�

!

(¼¿8W�Åý

'

"#

£;$M:}K3

%

##

`a�\ÍN¾�`ZÍ

!

ÃEpÅ>ò�

!

&Z;ZÍlUý¾ò�

%

$#

È�`ZÍý¾Ù3Õ>ò�

!

 £DEç:}4¿2�§

!

³`a�(\�`ZÍ

%

!#

�%Åý

##

O

$#!

d�ý¾]ÀI 

!

 µ³:}Ù3Õ8Q

!

#�Ú*�×>Ù

3,�

%

$"'"$"%#

tyxC9��

!"

{ãäåW

#

=æW

$

4�QBÐØ�4�QOØê4�Q

!

Â"l@$>Ù3ÕRQ

%

4�>PQl@Y�

>KÅ\DÌÁ/�>4¿UV

!

|Ù3Õ>8Q�µß=å��

!

ÜY"­(>Ù3ÕP

Q

%

�4�Q

!

ÓlÃE�>\DÚ¸}Å>�`

!

ßÚ4*°\��>DE>�`l�

Ø>

%

Øê4�Q

!

lßÚ4*°\��>DE>\Dl�¶>

%

|Ø�2Øêi41

!

i

=°\��>�éD2r<aKµ?��>lSK

!

��r�>Ù3Õ

%

aC^PQ'(

!

vY/N

!

[»SEÍ

'

!

�ò�¾pÅ�û\D

%

!

Ø�Q4�>ª�Cv¸�µac>�z

!

Âðñ>l�û>§`

!

ùS�âDEÍ

>\D

!

£�ÇÍIfÛz

%

"%

2

#

3

,

, - 6 7

,

Page 30: Aimages.china-pub.com/ebook7885001-7890000/7885477/ch02.pdf · ~DEhŠ*(\ “iÝ>DEhŠ•l m*ï~R‹-i$ ÿ‡T—„Ł$ T–O“

!

ØêQ4�>ª�

!

io.[!¶å5>Í4*µ¶>�û

!

Âðñ>lDEÍ>

\D

%

�â*Wä¸Õ

!

|ß=Ø�Q/Z

!

G0:}�ÇÍ,®

%

£YØêQio�¾S�

¶åR >�`4�µ¶��>¸Õ

!

i=>7 PQl

!

0=ØêQ�r�K:}4�

!

n1£]\�s4�>¾âK:}ñh

!

ßÚ�¶>KiW,4�¶(\��

%

$"

7ãäåW

çèéAÂÃÛåW

%

ñl�Ç=>Ù3Õ`M/(

!

@Yñ>Ù3ÕPQ

!

ß=å4

Ç��-ROQÅ4¿Í

!

l(^S­(>

$

ÌÁ/�>4¿UV

%

PQ;{d�

'

"#

ÅÆ�û>ñ

%

##

!°\K�d46Í

!

�DE4dC­4

!

|¦^io>4Q���(^TÖ�oñ

>4Q

%

$#

|4d>C\�û�

!

�f¬ñ>�û

!

�TÅý

"#%

!#

ý¾=³KÅ\Dª

!

,-8Q

%

çèêåAÂÃÛåW

%

a\PQlâ=Ì'/ä>Ä6

%

G0�DEöKVWB>l

SDEK'¾(\(�>�û

!

³Ã���¸�Âs±i�§>�û

!

n1�§Â"

!

:�

Idf¬>�û

%

Ç=>@Y?P>Ù3ÕPQl

T<CR@N9@

PQ

!

U8Q'òd�

'

"#

G0�$M>°\µ¶K�N(\�û

!

£�s�û-R?P�-M

!

ÃEpÅ>ø

�.<>ÃK

!

&ÅU�ªô

!

�$�ª>�û�§¾(\�û

%

##

�8Q

"#!

)*ÃEpÅ>ÃK�µ*�siW�§>�û¾À

%

$"(#

>?@A

DEFGl(\%&|}�k{4�ò>MN

!

Âl89:;<=��MQ�h'>(

\T�0Ò

!

Â)0lmý89:;<=>�×dq

%

Sº¦89:;><=ÉÊ

!

�"¯

¦�T»89:;RQ>Å-

$

&�O<=

!

|DEFGP¤>MN^�Úµ¦

!

»EmS

(>DEFGUVOPQ

!

a»l89:;<=(�µÂ>(\�ò�½

%

89:;l(Ì

ßµ]\:Í×ÎÖ�>

$

��OUVÄ�µZ�Z>.å:ÍOUV

!

U�>DEFGP

Q»l(4

!

�òµZ�Ôn]\v�>×Î

$

UVOPQ

!

W�¯Ò�¾ÙÚ

(

)

Ï

Ò&«0Å

!

¾89:;<=��MQ>1TKL~Òø�>@A

%

#% ,

!"#$%&'()

!

*#+,-./01