thin seam
短語(yǔ)詞組
- thin coal seam shearer 薄煤層采煤機(jī)
- extremely thin coal seam 極薄煤層
- thin coal seam group 薄煤層群
- thin coal seam mines 薄煤層礦井
- thin coal seam face 薄煤層工作面
- thin -seam 薄煤層
- extremely thin protective seam 極薄保護(hù)層
- thin coal seam mining 薄煤層開采 返回 thin seam