smoke prevention 防烟法 ; 防烟
smoke prevention division 防烟分区
smoke prevention staircase 防烟楼梯间
smoke-prevention stairwell 防烟楼梯间
smoke prevention stairwell 防烟楼梯间
When the velocity of jet stream from smoke prevention air curtain is more than 10m/s, 6 minutes for safety evacuation will be enough without mechanical ventilation.
在防烟空气幕喷射不小于10m/s 的向下射流时,即使不采用机械排烟的情况下,也能确保站台层人员6 分钟的安全疏散时间。
参考来源 - 地铁站火灾烟气扩散及控制的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
A survey by Hangzhou Center for Disease Control and Prevention shows that the scale of youth smoking is increasing and the age of people who smoke tends to be lower.
杭州市疾控中心调查发现，青少年吸烟比例逐渐加大，吸烟人群呈现低龄化的趋势。
The Centers for disease Control and Prevention estimates that secondhand smoke exposure causes 46,000 heart disease deaths every year in the United States alone.
美国疾病控制与防病中心估计，吸入二手烟仅仅在美国每年就导致4万六千人死于心脏病。
The Centers for Disease Control and Prevention estimates that secondhand smoke exposure causes 46, 000 heart disease deaths every year in the United States alone.
美国疾病控制与防病中心估计，吸入二手烟仅仅在美国每年就导致4万六千人死于心脏病。
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