无窗槛墙的玻璃幕墙,应在每层楼板外沿设置耐火极限不低于( )h、高度不低于( )m的不燃烧实体裙墙或防火玻璃裙墙。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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