... low seam mining machinery 薄煤层采煤机 low seam mining method 薄煤层采煤法 low seam 薄煤层 ...
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inclined low seam mining method [矿业] 倾斜薄煤层采煤法
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There have been some problems such as low coal recovery and difficult management after coal mining in steep seam mining method.
急倾斜煤层的回采一直存在着回采率低、采后难以管理等实际问题。
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