Tests show that coal with larger porosity, lower strength and higher velocity ofgas desorption is more dangerous in hazard ofoutburst.
试验表明突出危险煤较非危险煤孔隙率大，强度小，且具有更大的瓦斯解吸速度。
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He said the coal fight with nature, there are many uncertain factors, currently the largest coal mine safety management of risk from gasoutburst is the first.