英语词汇“differential fill-up collar”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	differential fill-up collar
释义	differential fill-up collar differential fill-up collar [‚dif·ə′ren·chəl ′fil ‚əp ‚käl·ər] (petroleum engineering) A mechanism installed in the bottom of a well, when casing is set in a drill hole that automatically admits drilling fluids into the casing as required.
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