大倾角特厚煤层水平分层(深部)综放开采地表沉陷与地表水渗流研究
대경각특후매층수평분층(심부)종방개채지표침함여지표수삼류연구
Study of surface subsidence and surface water seeping due to horizontal section top coal caving (deep mining) in high steep thick coal seam
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