overlying seam 中文意思是什麼
overlying seam
解釋
上部礦層-
Simulation on overlying strata ' s motion rule in shallow seam slice mining
淺埋厚煤層分層開采覆巖移動規律模擬研究 -
Numerical analysis on movement rule of overlying strata of shallow coal seam covered with thin bedrock
淺埋煤層開采覆巖移動規律數值分析 -
Numerical simulation study on effects of overlying rock and seam far way from protective coal seam
遠程下保護層開採煤巖體卸荷效應模擬研究
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