Datong Coal Mine Area

英 美
  • 大同矿区
  • area n.面积;地区,地段;区域;领域
  • coal n.煤;木炭vt.烧成炭;供应煤vi.加煤;装煤
  • Datong n.大同
  • mine pron.我的n.矿;地雷;矿藏v.采矿;用地雷炸
    1. According to the studying and acquainting with the direct roof control of Datong mining area,this paper offers a kind of simple and workable classification for direct roofs.
      根据作者对大同矿区直接顶板控制的研究和了解,提出了一种简单易行的直接顶分类方法。