“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	logarithm logarithmically convex function logarithmic amplifier logarithmic coordinate paper logarithmic coordinates logarithmic curve logarithmic decrement logarithmic derivative logarithmic differentiation logarithmic diode logarithmic distribution logarithmic equation logarithmic fast time constant logarithmic growth logarithmic multiplier logarithmic potential integrated profile integrated radiation integrated reflection integrated semiconductor integrated services digital network integrated software integrated thermionic circuit integrated train integrating accelerometer

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