题目内容 (请给出正确答案)
提问人:网友l******8 发布时间:2022年5月1日 08:59
[单项选择题]

对于σv,σd面,下列说法不正确的是()

A.σv面通过主轴

B.σd面通过主轴

C.σv面一定是σd

D.σd面一定是σv

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