“beam-balanced pump”的概念、定义、翻译、参考文献-科学参考

单词	beam-balanced pump
释义	beam-balanced pump [`bēm ´bal·ǝnst `pǝmp] ^{PETROLEUM ENGINEERING} An oil well pumping unit having a center-pivoted beam with the sucker rod plunger (pump) at the front end and a counterweight on the rearward extension.
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