“double valves”的概念、定义、翻译、参考文献-科学参考

单词	double valves
释义	double valves [¦dǝb·ǝl `valvz] ^{PETROLEUM ENGINEERING} Two valves in series used as subsurface traveling or standing valves in wells, the dual arrangement being more reliable than a single valve.
随便看	rumen ruminant Ruminantia rumination run run a line of soundings runaround runaround crosstalk runaround scrap runaway effect runaway electron runaway gun runaway star runaway tape runback run before the wind run book run chart runcinate run diagram run documentation run down a coast rundown line rundown tank Runge-Kutta method

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