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Penetrant testing is done according to its standard.
渗透检验标准是渗透检验的依据。
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Non-destructive testing. Penetrant testing. General principles.
无损检验。渗透检验。通用原理。
Dye-penetrant testing of the disc trunnions and piston rod heads.
对阀盘、耳轴活塞杆头的染料渗透剂测试。
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