本文讨论了矿井井型与服务年限的关系以及储量备用系数问题。
This paper deals with the relationship between the size and the life of coal mines and the problem concerning reserve coefficient.
本文讨论了矿井井型与服务年限的关系以及储量备用系数问题。
This paper deals with the relationship between the size and the life of coal mines and the problem concerning reserve coefficient.
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