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请教的问题1.矿井年产90万吨,达到设计产量集中在一个采区是否可以?2.这个矿井是超级瓦斯矿,第一水平深度300
Consult the question 1. Mine annual output of 900000 tons, to achieve the design of production concentrated in a mining area is it possible? 2. The mine is super gas mine, the first level of depth 300