On coal mining, especially in resource-exhausted reserves of tapping the potential of mine has a certain significance.
对煤矿开采、特别是资源枯竭型矿井的储量挖潜具有一定的借鉴意义。
On coal mining, especially in resource-exhausted reserves of tapping the potential of mine has a certain significance.
对煤矿开采、特别是资源枯竭型矿井的储量挖潜具有一定的借鉴意义。
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