常見例句雙語例句The horsehead is used to insure that the pull on the sucker rod string is vertical.驢頭用來確保抽油桿柱沿垂直方曏被提拉。www.infopetro.com.cnA method for analyzing sucker rod faults is introduced on the basis of fault tree theory.採用故障樹分析方法,建立了抽油桿故障樹。This paper analyzes the stress feature of sucker rod string in a horizontal well, and discusses the necessity of weighting rod in horizontal.本文首先分析了水平井中抽油桿柱的受力特點,討論了水平井中抽油桿柱加重的位置與必要條件。 返回 sucker rod