egg-hen egg  蛋鸡蛋

brown coal and bitumionus coal  褐煤和烟煤

City Suburbs Coal Mine of the Coal Electricity Group Company of Yonycheng  永城煤电集团公司城郊煤矿

coal and coal ash  煤及煤灰

Coal and Coal Char  煤与煤焦

coal and coal gas opening together  煤

coal and coal industry of Shanxi  山西煤炭

coal and coal processing in Shanxi  山西煤炭

Coal and Coking Coal Circulation  煤焦流通

COAL AND NON-COAL  煤与非煤

Coal as Received and Coal as Fired  入厂煤和入炉煤

coal bed methane and coal coordinative development  煤层气与煤炭协调开发

coal bed methane in coal mine area  煤矿区煤层气

coal consumption amount utilization ratio of coal  煤利用率

Coal mine and coal preparation plant  矿井及选煤厂

coal mining of fully -mechanized coal winning and caving the roof  综放开采

coal mining-transport-coal-fired power plant  隧道地震预报; 煤电

Coal petrography—Coal blending  煤岩学-配煤

coal preparation plant for steam coal  动力煤选煤厂