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问题	下行通风的有关标准
释义	法律分析：当采煤工作面进风巷道水平高于回风巷时，采煤工作面的风流沿风流倾斜向下流动，称下行通风。法律依据；《煤矿安全规程》第一百一十四条采、掘工作面应实行独立通风。第一百一十五条有煤(岩)与瓦斯(二氧化碳)突出危险的采煤工作面不得采用下行通风。在通风的隐患排查中规定：下行风风速不得小于1.0~1.2m/s。
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