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【多选题】
矿井通风工作的重要要求包括（ ）。A.
高瓦斯矿井每个采区必须设置至少l条专用
B.
压入式通风机必须安装在巷道中
C.
巷道使用局部通风机通风的掘进工作面不得停风
D.
掘进时，长距离巷道宜采用压入式通风
E.
混合式通风适用于沼气涌出量很低的长距离巷道
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