单选题:设有中央空调系统的多层办公综合楼,设有自动喷火灭水系统,其棚顶、墙面、地面装修材料燃烧性能等级最低应为(  )

题目内容:
设有中央空调系统的多层办公综合楼,设有自动喷火灭水系统,其棚顶、墙面、地面装修材料燃烧性能等级最低应为(  ) A.A级,B1级,B1级
B.A级,B2级,B2级
C.B1级,B1级,B2级
D.B1级,B2级,B2级

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