4钻工钻井队有机械师 吗 ?Are there machinists in the oil - drilling group?钻工用合适的丝扣油涂抹接头母扣.The Floormen apply proper pipe dope into the thread box of the pipe joint.操作大钳时,必须教导钻工把手放在正确位置.The Floormen be instructed on proper placement...
He grabbed at a protrusion of rock with his right hand.他用右手抓住了一块凸起的岩石。A similar rocky protrusion was noticed in the north apse.在北侧半圆壁龛另有一块相似的石头.But the retrusion of alveolar mandible led to chin protrusion.前颅底和下颌骨发育正常,而下...