题目内容

以下关于交叉磁轭检验焊缝的叙述,哪条是正确的?

A. 交叉磁轭应连续拖动,检测速度尽量均匀
B. 交叉磁轭的磁极与工件表面间隙不应超过1.5mm
C. 应控制交叉磁轭的行走速度不超过4m/min
D. 以上都是

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