Abstract: It has been successfulto mploy the planetary differential gear device to function as the automati sychronizer of GCF-1500 percussive reverse-circulation drills.是什么意思_Abstract: It has been successfulto mploy the planetary differential gear device to function as the automati sychronizer of GCF-1500 percussive reverse-circulation drills.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句