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单词 magnetic inspection oil
释义 magnetic inspection oil
[mag`ned·ik in`spek·shǝn ´ȯil]
METALLURGY
A light petroleum oil, such as kerosine or naphtha, to which has been added fine ferromagnetic particles (usually colored black or red for contrast) to form an inspection penetrant; when the penetrant is applied to a metal surface being inspected, the ferrous particles accumulate in any surface cracks by magnetic attraction, thereby permitting the cracks to be discernible.
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