“bumper jar”的概念、定义、翻译、参考文献-科学参考

单词	bumper jar
释义	bumper jar [`bǝm·pǝr ´jär] ^{PETROLEUM ENGINEERING} An expansion joint installed on the drill stem of a floating offshore drilling rig, permitting vertical movement of the upper section while the lower section of the tool remains stationary.
随便看	line of code line of collimation line of curvature line of departure line of electrostatic induction line of elevation line of fall line of flight line of flux line of force line of impact line of magnetic induction line of observation line of position line of retirement line of return line of sight line-of-sight velocity line of soundings line of striction line of strike line of support line of thrust line of tunnel line oiler

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