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当前学科:磁粉检测
题目:
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直流电磁化时,发现一个显示。为了确定它是否为近表面缺陷,应采取的合理方法是()
A . 使用更大的电流重新检测
B . 退磁后用小电流重新检测
C . 用全波整流电重新检测
D . 用交流电重新检测
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