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从这些深矿中取得煤是很昂贵的。
The extraction of coal from these deep mines is expensive.
youdao
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大块率是评价露天矿台阶深孔爆破质量的重要指标之一。
Simulation on effect of stemming length to deep hole bench blasting;
youdao
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大块率是评价露天矿台阶深孔爆破质量的重要指标之一。
Simulation on effect of stemming length to deep hole bench blasting;
youdao