... thin coal seam 薄煤层 middle thick coal seam 中厚煤层 thick coal seam 厚煤层 ...
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middle and thick coal seam 中厚煤层
middle thick coal seam
中厚煤层
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The concrete construction methods and effects of mining technology in the middle thick coal seam are introduced.
介绍了中厚煤层回采工艺的具体施工方法和效果，同时介绍了工作面支护参数的计算。
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The Middle and Lower Jurassic with thick coal seam is widely distributed in Northwest China.
西北地区中、下侏罗统煤层广布，厚度较大；
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