加工Φ20mm以下未淬火的小孔,尺寸精度IT8,表面粗糙度Ra3.2~1.6,应选用( )加工方案。

加工Φ20mm以下未淬火的小孔,尺寸精度IT8,表面粗糙度Ra3.2~1.6,应选用( )加工方案。(本题2.0分) A、 钻孔-镗-磨 B、 钻-粗镗-精镗

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Compared with his sister, Jerry is even more _____

Compared with his sister, Jerry is even more ______ (敏感)to, and more easily trou

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