“beam pumping unit”的概念、定义、翻译、参考文献-科学参考

单词	beam pumping unit
释义	beam pumping unit [`bēm `pǝm·piŋ ´yü·nǝt] ^{PETROLEUM ENGINEERING} A device used in sucker rod pumping which has a horizontal member (walking beam) that is worked up and down by a rotating crank to produce reciprocating motion.
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