coal mining
短語(yǔ)詞組
- coal -mining methods 採(cǎi)煤方法
- coal surface mining 露天採(cǎi)煤
- single coal seam mining 單一煤層開(kāi)採(cǎi)
- coal resources mining 煤炭資源開(kāi)採(cǎi)
- coal pillar mining 帶煤柱開(kāi)採(cǎi)
- coal mine mining 鑛井開(kāi)採(cǎi)
- coal caving mining 煤採(cǎi)煤;放頂煤開(kāi)採(cǎi);放頂煤
- opencast coal -mining 露天採(cǎi)煤 返回 coal mining