... poor-boy job 一揽子承包作业 poor-boy rig 浅井钻机 poorly graded 分级差的;分选差的 ...
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However, the study in the hydraulic top drive only used in the service machine, poor-boy rig, also there have no research on deep and ultra-deep series of hydraulic top drive unit in China.
然而,对液压顶驱的研究,还停留在修井机、和浅井钻机上。国内目前还没有深井和超深井系列的液压顶驱装置。
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