Coalla科阿利亚
coaln.煤;木炭vt.烧成炭;供应煤vi.加煤;装煤
coal tempering煤加湿
coal ash field平原燃煤灰场
coal potential含煤远景
coal dust mill磨煤机
coal bed pitch煤层倾角
Coal seam goal煤层采空区
coal separator选煤机
Coal-bearing煤系
coal pinch out煤层尖灭
coal machinery采煤机械