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CNG
≈
5
5<E
/?)K)!')KNG!H"
⇒
CNG"
≈
&
&5E
NG
≈
;:
6E
,-+
O
M
"
#v
'8
K
1
)
K
1+O
')8
K
'8
⇔
W
KW
⇔
K
OAB
OAB ODC
ODC
OA S S
S S S S S S ab
OC S S
= = ⇔ = = = =
H
na
K
K
ab
')8
K
a b ab a b+ + = +
B
')8
K
( )
1"NM N1"G+ ≈
!= 5G)
3
G