The paper had a coal water mixture test with vitrain coal, bright coal and dull coal from Ningtiaota coal in Shenfu mining area.
选择神府矿区柠条塔
中的镜、亮和暗
了制水浆试验。
The paper had a coal water mixture test with vitrain coal, bright coal and dull coal from Ningtiaota coal in Shenfu mining area.
选择神府矿区柠条塔中的镜、亮和暗了制水浆试验。
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