The break of gear shaft teeth in well drilling pump was analyzed by chemical composition analysis,mechanical properties test,metallographic microstructure examination and macro and micro-fractography.是什么意思_The break of gear shaft teeth in well drilling pump was analyzed by chemical composition analysis,mechanical properties test,metallographic microstructure examination and macro and micro-fractography.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句