“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	audio masking audiometer audiometry audio-modulated radiosonde audio oscillator audio patch bay audio peak limiter audio range audio response audio response unit audio signal audio spectrometer audio system audio taper audio transformer audiovisual audiphone audit audition auditory auditory association area auditory impedance auditory nerve auditory perspective auditory placode

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