The development of tectonically deformed coal may qualitatively reflect hazard of gas outburst.
构造煤的发育程度可以定性的反映瓦斯突出危险性。
Is spam causing the environmental hazard of greenhouse gas emissions?
垃圾邮件引起温室气体排放，导致环境危害？
Tests show that coal with larger porosity, lower strength and higher velocity of gas desorption is more dangerous in hazard of outburst.
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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