为了克服剪钉式和反扣式两种安全接头的不足，研制出一种滑套式井下安全接头。
To overcome the shortcomings of the shear pin type joint and left-hand thread type joint, a sliding sleeve subsurface safety joint is developed.
遵照你方要求，我们正寄上一套布匹剪样。
We are sending you a set of piece goods samples at your request.
为确定代表土抗剪强度的节理单元竖向刚度系数，文中提出了一套相应的计算公式和试算迭代的计算方法，用来逐步逼近其真值。
In order to approximate the actual vertical stiffness coefficients of the joint elements representing the shear strength of soil, formulas and iteration method are suggested.
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