单项选择题
A.10% B.6% C.5% D.15%
A.0.4m~1.0m B.0.5m~1.0m C.0.6m~1.0m D.0.6m~1.5m
A.1000mm~1500mm B.1500mm~2000mm C.2000mm~2500mm D.2500mm~3000mm
A.75 B.60 C.65 D.80
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