magnetic particle inspection
柯林斯词典
1. N a method of testing for cracks and other defects in a magnetic material, such as steel, by covering it with a magnetic powder and magnetizing it: any variation in the concentration of the powder indicates a flaw in the material 磁粉檢查; 在磁物質上檢測裂痕和其它瑕疵方法[engineering]
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