常见例句双语例句It shows that the fractures of drill-stem subs are ascribed to outside diameter and the irrational bend strength between inside and outside threads.通过分析计算认为，钻柱转换接头断裂原因与外径不符合标准及内、外螺纹接头弯曲强度比不合理有关。 返回 drill-stem subs