This paper discussed methane emission, the reasons for methane reduction in up corner, problems should be considered in the condition of change from normal ventilation into downriver ventilation.

对下行通风时瓦斯涌出及下隅角瓦斯减少的原因进行论证，对上行风改为下行风应注意的问题进行了论证。

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This paper discussed methane emission, the reasons for methane reduction in up corner, problems should be considered in the condition of change from normal ventilation into downriver ventilation.

对下行通风时瓦斯涌出及下隅角瓦斯减少的原因进行论证，对上行风改为下行风应注意的问题进行了论证。

youdao