单项选择题
A.0.8m B.0.9m C.1m D.1.1m
A.800目/100cm2 B.1000目/100cm2 C.1500目/100cm2 D.2000日/100cm2
A.5个B.4个C.3个D.2个
A.600mm B.500mm C.400mm D.250~300mm
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