特厚煤层
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20 m very thick seam m特厚煤层
m very thick seam m特厚煤层
very thick coal seam 特厚煤层
very thick outburst coal seam 特厚突出煤层
very thick and inflammable seam 特厚易燃煤层
very thick seam
非常厚的接缝
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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