The output connection in transitional period was one of the key technical difficulties during the transition from open-pit to underground mining.
过渡期的产量衔接是矿山露天转地下开采关键技术难题之一。
The output connection in transitional period was one of the key technical difficulties during the transition from open-pit to underground mining.
过渡期的产量衔接是矿山露天转地下开采关键技术难题之一。
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