短語(yǔ)詞組

短語(yǔ)

• downward d mining 下行開(kāi)採(cǎi)
• downward filling mining method 下曏充填採(cǎi)鑛法
• downward cemented filling mining 下曏膠結(jié)充填採(cǎi)鑛法
• downward cut -and-fill mining 下曏膠結(jié)充填法
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