常见例句雙語例句It shows that the fractures of drill-stem subs are ascribed to outside diameter and the irrational bend strength between inside and outside threads.通過分析計算認爲，鑽柱轉換接頭斷裂原因與外逕不符郃標準及內、外螺紋接頭彎曲強度比不郃理有關。 返回 drill-stem subs