问题描述:
[单选]
千分尺测量螺杆上螺纹的螺距()mm,转1/50周(1格),即移动()mm
A.1,0.02
B.0.5,0.01
C.0.5,0.02
D.1,0.01
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答案解析:无
答案解析:无
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