单项选择题
A.5倍 B.2倍 C.1/2 D.1/5倍
A.0.1% B.0.2% C.0.3% D.0.5%
A.0.01mm B.0.02mm C.0.03mm D.0.05mm
A.0.01—0.03mm B.0.03—0.05mm C.0.001—0.003mm D.0.003—0.005mm
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