thin seam

短語詞組

短語

• thin coal seam shearer 薄煤層採煤機(jī)
• extremely thin coal seam 極薄煤層
• thin coal seam group 薄煤層群
• thin coal seam mines 薄煤層鑛井
• thin coal seam face 薄煤層工作麪
• thin -seam 薄煤層
• extremely thin protective seam 極薄保護(hù)層
• thin coal seam mining 薄煤層開採
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