用自比差动式探头对管材进行探伤时,能抑制干扰信号是()。A.应力缓慢变化 B.直径缓 发布时间:2017-05-12 18:53 │ 来源:www.tikuol.com 题型:单项选择题 问题: 用自比差动式探头对管材进行探伤时,能抑制干扰信号是()。A.应力缓慢变化B.直径缓慢变化C.电导率缓慢变化D.以上三点全是
题型:单项选择题 Being afraid of making mistakes,the little boy ____answer his teacher’s question.A.does dareB.doesn’t dare toC.daren’tD.not dare to 查看答案