rock electric drill

常見例句

雙語例句

• Since the process of colliding mechanism of electric rock drill is complex, there isn′t a set of calculating method practically still now.
  電動(dòng)鑿巖機(jī)沖擊機(jī)構(gòu)因其受力過程比較復(fù)雜，至今尚無一套可行的計(jì)算方法。
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