coal face machinery 中文意思是什麼
coal face machinery
解釋
採煤工作面機械-
Coal face machinery
採煤工作面機械 -
Graphical symbols for use in technical documentation of coal mine machinery - graphical symbols for coal face support machinery
煤礦機械技術文件用圖形符號採煤工作面支護機械圖形符號 -
The roof control technology of combined machinery island face in jining no. 2 coal mine
濟寧二號煤礦綜放孤島工作面的頂板控制技術
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