The working condition of drillpipe is very serious, especially in the dogleg or build section.Large alterative bending stress gives rise to the fatigue failure of drillpipe.是什么意思_The working condition of drillpipe is very serious, especially in the dogleg or build section.Large alterative bending stress gives rise to the fatigue failure of drillpipe.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句