underground mining
短語(yǔ)詞組
- underground col mining 地下採(cǎi)煤
- underground coal mining 地下採(cǎi)煤
- underground E mining 地下開(kāi)採(cǎi)
- Underground melting mining 地下熱熔開(kāi)採(cǎi)
- underground d mining 地下採(cǎi)鑛
- underground coal mining method 地下採(cǎi)煤方法
- underground bench mining 井下梯段採(cǎi)鑛法
- underground trackless mining vehicle 地下無(wú)軌採(cǎi)鑛車輛 返回 underground mining