drilled oil ring是什么意思


中文翻译钻孔刮油环

网络释义

1)drilled oil ring,钻孔刮油环2)Oil scraper ring,刮油环 (油环)3)wiper compression ring,刮油气环4)scraping ring,刮油环5)oil scraper ring,刮油环;刮油圈6)deep drilling oils,深孔钻油

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