“back-pressure valve”的概念、定义、翻译、参考文献-科学参考

单词	back-pressure valve
释义	back-pressure valve [`bak ´presh·ǝr ´valv] ^{PETROLEUM ENGINEERING} A check valve installed in a natural- gas well bore to shut off gas flow while replacing the blowout preventer (used during drilling) with a christmas tree piping arrangement, which controls gas flow out of the completed well.
随便看	enzyme induction enzyme inhibition enzyme repression enzyme unit enzymology Eocambrian Eocanthocephala iterations per second iterative array iterative division iterative filter iterative impedance iterative method iterative process iterative routine iteroparity Ithomiinae Itonididae ITV I-type magma i-type semiconductor Itô's formula Itô's integral ium ion Ivanov reagent

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