2019-2020
1 m 0.8mg
A B C D
2 2012 400 428 43
( )
A B
C D
3
O
AB
AAB
BAB
CAB
DAB
4 m R
( )
A0.5R B1.0R C2.5R D3.5R
5
r l r 2 r 1> r 2 Ek1 E k2
T1T2 ( )
AE k2 >Ek1 T2<TlBE k2 <Ek1 T 2>Tl
CE k2 <Ek1T2<TlDE k2 >Ek1T2>Tl
6
A L1
B L2
C L1