防火间距是指相邻两栋建筑物之间,保持适应火灾扑球、人员安全疏散和降低火灾时热辐射的必要间距。高层之间的防火间距为( )米,高层与多层的防火间距为( )米。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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