单项选择题
A.7.5m/min B.8.5m/min C.9.5m/min D.10.5m/min
A.7.5m/min B.8.5m/.min C.9.5m/min D.10.5m/min
A.1~7.5m/min B.2~7.5m/min C.3~7.5m/min D.4~7.5m/min
A.0.8m~1m B.1m~1.2m C.1.3m~1.5m D.1.5m~1.8m
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