shallow thick coal seam的意思|示意
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浅厚煤层
shallow thick coal seam的网络常见释义
浅埋深特厚煤层 ... shallow coal seam 浅埋煤层 ; 浅埋 shallow thick coal seam 浅埋深特厚煤层 approximate shallow buried coal seam 近浅埋煤层 ...