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加工Φ20mm以下未淬火的小孔，尺寸精度IT8，表面粗糙度Ra32-16，应选用（ ）加工方案。
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加工Φ20mm以下未淬火的小孔，尺寸精度IT8，表面粗糙度Ra32-16，应选用（ ）加工方案。
A、钻－镗－磨
B、钻－粗镗－精镗
C、钻－扩－铰
D、钻－扩－磨
时间：2021-09-03 16:08
关键词：
联大
河南理工大学
机械设计制造及其自动化
机械制造技术基础
答案解析
C@#@C
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