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【单选题】
下列对幕墙式建筑的保温材料防火要求，错误的是( )。
A.
建筑高度大于等于24m时，保温材料的燃烧性能应为B1级
B.
建筑高度小于24m时，保温材料的燃烧性能应为A级或B1级，当采用B1级保温材料时，每层设置水平防火隔离带
C.
保温材料应采用不燃材料作防护层，防护层保温材料完全覆盖，防护层厚度不应小于3mm
D.
采用金属、石材等非透明幕墙结构的建筑，应设置基层墙体，其耐火极限应符合现行防火规范关于外墙体耐火极限的有关规定
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