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Advancing hole is one of local prevent outburst measure coal road heading face coal - and - gas outburst mine.
超前钻孔是煤与瓦斯突出矿井中煤巷掘进工作面的局部防突措施之一.
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Pressed ventilation in heading face is actually a restrained wall - attached jet ventilation in confined space.
独头巷道压入式通风是有限空间的受限贴附射流.
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