【单选题】水龙头是钻机的旋转系统设备 ,主要作用是
B.
将发动机的动力传递给井下钻具,驱动钻头旋转,钻出井眼完
C.
下套管或起下钻时,承托井中全部套管柱或钻杆柱重量
【简答题】 Is Chang-Woo Chinese?
【单选题】The word woo-wooey in the third paragraph probably means
【单选题】Is Chang-Woo Chinese?
【单选题】下套管或起下钻时,()要承托井中全部套管柱或钻杆柱重量。
【判断题】钻机的转盘主要作用为:钻进时转动钻具;井下动力时承受反扭矩;起下钻、下套管时承托钻杆或套管重量;处理事故时,造扣、倒扣(上提)。()
【简答题】The researchers, led by Hwang Woo-suk, insist they cloned an Afghan hound, only to help investigate (研究) human disease, including the possibility of cloning stem cells (干细胞) for treatment purposes. Bu...