不定项选择
档内架空线上任意两点的垂向应力的差等于该两点间的高度差与比载之乘积。
A.正确
B.错误
档内架空线上任意两点的垂向应力的差等于该两点间的高度差与比载之乘积。
A.正确
B.错误
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多项选择题
Which are the methods of interview investigation? ()
Which are the methods of interview investigation? ()
A.Face-to-face interview
B.Questionnaire investigation
C.Informal discussion
D.Telephone interview