drill-stem subs

常見例句

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(rèn)為，鉆柱轉(zhuǎn)換接頭斷裂原因與外徑不符合標(biāo)準(zhǔn)及內(nèi)、外螺紋接頭彎曲強(qiáng)度比不合理有關(guān)。
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