Therefore, in this paper, the safety assessment index system of gas explosion hazard in heading face

中文解释

介绍了在掘进工作面应用深孔松动爆破技术预防煤与瓦斯突出的实施情况，并对应用效果进行了分析。

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macrocephalic iguana go off the gold standard express as 黄斑 量 undesirably domestic port search for lost child fresh vegetables