The tunnel instability of deep mining in metal mines has increasingly become one of the main problems troubling normal production of mine.
金属矿山深部开采巷道失稳日益成为困扰采矿正常生产的主要问题之一。
The tunnel instability of deep mining in metal mines has increasingly become one of the main problems troubling normal production of mine.
金属矿山深部开采巷道失稳日益成为困扰采矿正常生产的主要问题之一。
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