题目内容

以下关于螺旋测微器使用正确的是( )

A. 测量前需提前读出零位读数
B. 零位读数只能是正值
C. 直接测量的结果应减去零读数修正成合理的结果
D. 用毕还原时,测量砧台与测量螺杆间应留有空隙,以免热胀使螺杆变形

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