高瓦斯煤层群开采沿空留巷U型通风煤与瓦斯共采试验研究
고와사매층군개채연공류항U형통풍매여와사공채시험연구
Pilot Study on Coextraction of Coal and Gas and U-type Ventilation in Road Retained for Mining of High Gassy Group of Seams
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