coalway煤巷
coaln.煤;木炭vt.烧成炭;供应煤vi.加煤;装煤
coal mine rescue robot煤矿救援机器人
coal- saving machine节煤器
coal-forming feature聚煤特征
coal-industrial city煤炭型工业城市
coal -powered boiler燃煤锅炉
coal mining activities采煤活动
coal seam genetic type煤层成因类型
coal coking wastewater焦化废水
Coal Safety Management煤矿安全管理
coal mine construction矿井建设