A.0.3m B.0.4m C.0.5m D.0.6m
A.900 B.1000 C.1500 D.2000
A.4 B.5 C.6 D.7
A.等于或小于 B.小于 C.大于 D.等于或大于
A.1:20 B.1:30 C.1:35 D.1:40