“bumper sub”的概念、定义、翻译、参考文献-科学参考

单词	bumper sub
释义	bumper sub [`bǝm·pǝr ´sǝb] ^{PETROLEUM ENGINEERING} A motion compensator that maintains constant weight on the drilling bit during vertical motion of a floating offshore drilling rig and also provides a jarring action to remove heavy objects in the borehole.
随便看	hard pad hard palate hardpan hard paste porcelain hard patch hard porcelain hard radiation hard return hard rime hard rock hard-rock driller hard-rock mine hard-rock miner hard-rock tunnel boring hard rot hard rubber hard-sectored disk hard silk hard site hard solder hard-solder hard-sphere collision theory hardstand hard superconductor hard-surface

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