单项选择题
A.0.01mm B.0.02mm C.0.05mm D.0.5mm
A.0.1 B.0.3 C.0.5 D.0.7
A.钻底孔 B.倒角 C.内孔抛光 D.三锥铰削
A.10mm B.20mm C.30mm D.40mm
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