Where particles are attracted to a site on the surface of a part by a magnetic leakage field that is caused by a condition such as a crack lapor other condition not acceptable to the applicable standards for the partthen we have:当磁粉在零件表面某一点因某一状态如裂纹、折受或其它应用标准不可接受的状态产生的漏磁场的吸引，被称为