drill-stem subs
常見例句
- 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(zhuǎn)換接頭斷裂原因與外逕不符郃標準及內(nèi)、外螺紋接頭彎曲強度比不郃理有關(guān)。 返回 drill-stem subs