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Keyword [Extra-thick soft coal seam]
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1. Study On Movement Law Of Surrounding Coal-rock In The Stope Of Steep And Extra-thick Soft Coal Seam
2. Research On Mechanism Of Active Load-bearing Of Arch-beam Coupling In Extra-thick Soft Coal Seam
3. Study On Roadway Layout And Support Technology Of Fully Mechanized Mining Under Extra Thick Soft Coal Seam
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