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防烟楼梯间
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防烟楼梯间
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smoke-proof staircase
防烟楼梯间
为防止火灾时烟和热气进入,在入口处设有防烟的前室、敞开式阳台或凹廊(统称为前室)等设施的楼梯间。通向前室和楼梯间的门均为乙级防火门,以防止火灾时的烟和热气进入的楼梯间。
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adding (doubling) method
adding interferometer
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Addis Ababa Peace Treaty
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Additional act 1834
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Additional Protocol Relative to Inter-American Non-Intervention
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