单项选择题
A.2m B.1m C.1.5m D.5m
A.5KG钢瓶 B.10KG钢瓶 C.15KG钢瓶 D.50KG钢瓶
A.5倍 B.50倍 C.250倍 D.500倍
A.100% B.95% C.85% D.50%
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