methane content in coal seam
...煤层瓦斯含量；煤层瓦斯压力；煤层透气性系数；煤层孔隙率；钻屑解吸 [gap=2587]Key words：coal and methane outburst；tunnel exposing coal seam；methane content in coal seam；coal methane pressure；permeability coefficient of coal seam；porosity of coal se..
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methane content in coal seam
煤层中甲烷含量
以上为机器翻译结果，长、整句建议使用 人工翻译 。