阳煤集团是全国瓦斯涌出量最大的矿区之一。
This paper is actually a technical report on mine gas control in Yangquan Coal Group, one of highly gassy coal mines in this country.
阳煤集团是全国瓦斯涌出量最大的矿区之一。
This paper is actually a technical report on mine gas control in Yangquan Coal Group, one of highly gassy coal mines in this country.
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