单选题:《建筑内部装修防火施工及验收规范》规定,顶棚内涂刷防火涂料,湿涂覆比值应大于(  )g/m2。

题目内容:
《建筑内部装修防火施工及验收规范》规定,顶棚内涂刷防火涂料,湿涂覆比值应大于(  )g/m2。 A.200
B.300
C.400
D.500
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