“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	Southeast Drift Current southeaster South Equatorial Current souther southerly burster Southern Cross Southern Crown Southern Fish southern lights Southern Polar Front Southern Triangle south foehn south frigid zone south geographical pole south geomagnetic pole South Indian Current southing South Pacific Current south point south polar distance South Pole south pole south temperate zone south tropical disturbance southwester

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