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The operation cost of small scale trackless equipment in a mining test is described.
介绍了小型无轨设备在采矿试验中的运行成本情况。
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The underground mining is a problem of "large-scale system".
矿床的地下开采是一个“大系统”问题。
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The underground mining is a problem of "large-scale system".
矿床的地下开采是一个“大系统”问题。
youdao