对现行矿井瓦斯等级鉴定方法进行分析，指出了现行鉴定方法的不合理性，对今后的瓦斯等级鉴定工作提出了建议。
Analysing the appraising method for grade of gas, the thesis points out the irrationality of it, and gives advice on appraising method for gas grade.
训练好的神经网络、矿井煤与瓦斯突出指标数据库和其它程序绑定在一起组成了矿井突出危险等级评价系统。
Put the trained neural network, the indexes database of coal and gas outburst and other programs together constituted the system to evaluate the mine outburst dangerous grade.
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