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单项选择题
A.40m≥L0≥20m
B.40m≥L0>20m
C.40m>L0≥20m
D.40m>L0>20m
单项选择题
A.150m≥L0≥40m
B.150m≥L0>40m
C.150m>L0≥40m
D.150m>L0>40m
单项选择题
A.100m≥L≥30m
B.100m≥L>30m
C.100m>L≥30m
D.100m>L>30m
单项选择题
A.1000m≥L≥500m
B.1000m≥L>100m
C.1000m>L≥100m
D.1000m>L>100m