coal-rock

英 ['kəʊlr'ɒk] 美 ['kəʊlr'ɒk]

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coalless coal coal-fired power enterprise coal roadway drilling machine coal-gas washing wastewater coal worker rs pneumoconiosis coal mine businedd enterprise coal black liquor slurry char coal landing-storage system coal underground gasification coal-gangue fragmental size coal buring power plant units

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