For the combination type of mechanical &electrical drilling rigs, i.e.JD &LD, the drawworks is driven by narrow V-belt and chain compound drive.是什么意思_For the combination type of mechanical &electrical drilling rigs, i.e.JD &LD, the drawworks is driven by narrow V-belt and chain compound drive.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句