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【多选题】
根据燃烧的必备条件,下列关于防火机理的说法,正确的是:A.
利用不燃或难燃材料包裹材料，如钢结构表面喷涂厚型防火涂料。
B.
钢结构表面喷涂防火涂料是利用防火涂料导热系数小，可以延迟火焰温度向钢材传递的速度。
C.
钢结构防火采用和超防火涂料，其原理是利用其受热后膨胀发泡，形成碳质碳质隔热层。
D.
重型木结构建筑利用木材导热系数较低，碳化后可以阻隔空气达到自我防火的目的。
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