Analyzes the feasibly and necessary adopting two-way tulling in suppergaseous, introduces the implementation in Duerping mine.
分析论证了在高瓦斯矿井采用双巷掘进的可行性和必要性，并介绍了在杜儿坪矿的实施情况。
Analyzes the feasibly and necessary adopting two-way tulling in suppergaseous, introduces the implementation in Duerping mine.
分析论证了在高瓦斯矿井采用双巷掘进的可行性和必要性，并介绍了在杜儿坪矿的实施情况。
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