[单选题]

用同缘测量法测量两个孔的距离时,外边缘距离650mm,内边缘距离630mm,两个孔的距离是?()

A .630mm

B .640mm

C .650mm

参考答案与解析:

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用同缘测量法测量两个孔的距离时,外边缘距离650mm,内边缘距离630mm,两个