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【单选题】
关于磁粉探伤，以下说法错误的是（ ）A.
磁粉探伤的原理是铁磁材料（铁、钴、镍及其合金）置于磁场中，即被磁化
B.
湿法检测在检测中具有较高的
C.
磁粉探伤需双面法检测
D.
按照在磁化工程中工件上磁粉施加的时间长短，可以把磁粉检验分为连续法和剩磁法
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