上覆岩床对煤层瓦斯赋存特征的影响——以宣东二矿Ⅲ3煤层为例
상복암상대매층와사부존특정적영향——이선동이광Ⅲ3매층위례
Impact of Overlying Sills on Coal Seam Gas Hosting Characteristics——A Case Study of Coal Seam Ⅲ3 in Xuandong No.2 Coalmine
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