coal mining
短語(yǔ)詞組
- coal -mining methods 采煤方法
- coal surface mining 露天采煤
- single coal seam mining 單一煤層開(kāi)采
- coal resources mining 煤炭資源開(kāi)采
- coal pillar mining 帶煤柱開(kāi)采
- coal mine mining 礦井開(kāi)采
- coal caving mining 煤采煤;放頂煤開(kāi)采;放頂煤
- opencast coal -mining 露天采煤 返回 coal mining