This involves keeping the height of the smoke layer above the highest level of occupancy for a defined period of time, longer than the expected time to evacuate the building.
这就要求在规定的逃生时间内，保证烟气层存在于规定的逃生安全高度以上。
This involves keeping the height of the smoke layer above the highest level of occupancy for a defined period of time, longer than the expected time to evacuate the building.
这就要求在规定的逃生时间内，保证烟气层存在于规定的逃生安全高度以上。
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