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通风的目的,是供给坑道内足够的新鲜空气,降低各种有害有毒气体和粉尘浓度,保证作业人员的身心健康。为了使坑道内通风良好,必须对通风机进行正确的选择、安
The purpose of ventilation is to supply enough fresh air in the tunnel to reduce the concentrations of various harmful toxic gases and dusts and ensure the physical and mental health of workers. In order to ventilate the tunnel, the ventilator must be properly selected and safe