2019-2020
1 G
A G
B G
C G G
D G G
22018 11 16 26 SI
4 2019 520
A B C D
3
A
B
C
D 0 0
4 ( )
A
B
C
D
5 AB
L1 L2
AL1L2
BL1L2
CL1L2
DAB L1L2
6 aObOcO O
304560. abc
( ) ( )