不同煤阶区域预测瓦斯含量临界值的实验研究及应用——以安阳矿区龙山矿无烟煤和大众矿贫煤为例
불동매계구역예측와사함량림계치적실험연구급응용——이안양광구룡산광무연매화대음광빈매위례
An experimental study of methane gas critical value achieved by regional prediction at mining areas with different coal ranks: Case studies of Longshan anthracite coals and Dazhong lean coal in the Anyang mining area, northern Henan province, China
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