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long dead-end driving face ventilation
expl.
长巷道掘进通风
掘进长巷道时排除作业面污浊风流的局部通风方法。长巷道掘进通风多采用混合式通风方式,并且应尽量选用大直径风筒和保证风筒连接质量,以减少漏风和降低风筒风阻
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