The building will have a main staircase width of not less than 1.50 meters, and if there are two stair width of not less than 1.20 m., The fire escape, not be less than 0.90 meters, the distance between the fire escape, not less than 60 meters and the distance from the target. tons until the end of the fire escape can not be less than 10 meters, which is the fire escape stairs outside the building. To the fire escape to a layer 2.
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