• Half coal rock lane quick-excavating technique under the condition of "two hard" has always been a main excavating problem influencing the Datong mining Cop.

    前言:“条件下半岩巷掘进一直影响大同煤矿集团有限责任公司采掘关系主要问题

    youdao

  • Half coal rock lane quick-excavating technique under the condition of "two hard" has always been a main excavating problem influencing the Datong mining Cop.

    前言:“条件下半岩巷掘进一直影响大同煤矿集团有限责任公司采掘关系主要问题

    youdao

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