poor-boyCOCA²⁸⁰¹³⁶⁺⁵ 基本例句 🌏可怜的孩子；穷小子；影评人贫穷男 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。 lib.swpu.edu.cn