题目内容 (请给出正确答案)
提问人:网友c********1 发布时间:2022年3月12日 08:38
[单项选择题]

扩孔可以达到的精度一般为IT10~IT19级,表面粗糙度一般为Ra()μm。

A.12.5~3.2

B.15.5~5.2

C.17.5~7.2

D.19.5~9.2

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