Keyword [Soft rock roof] Result: 1 - 3 | Page: 1 of 1 1.  Research On Support Technology Of Mining Roadway In Extra-thick Coal Seam Of Soft Rock Roof 2.  Study On The Development Law Of Repeated Mining Induced Water-conducted Fissures And Mining Upper Limit Under The Condition Of Soft Rock Roof 3.  Study Of Aquiferous Soft-rock Roof Support Technology In 11 Mining Area 2 Coal Aquifer Of The Maiduoshan Coal Mine   <<First  <Prev  Next>  Last>>  Jump to

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