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• Air may leak in at the apparatus.
• The part to be tested is first immersed in a special penetrant which seeps into the finest cracks.
Источник:
Русско-английский научно-технический словарь
на Gufo.me
• Air may leak in at the apparatus.
• The part to be tested is first immersed in a special penetrant which seeps into the finest cracks.