thin seam

短语词组

短语

• thin coal seam shearer 薄煤层采煤机
• extremely thin coal seam 极薄煤层
• thin coal seam group 薄煤层群
• thin coal seam mines 薄煤层矿井
• thin coal seam face 薄煤层工作面
• thin -seam 薄煤层
• extremely thin protective seam 极薄保护层
• thin coal seam mining 薄煤层开采
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