单选题:当防火分隔部位的宽度不大于30m时,防火卷帘的宽度不应大于()。

题目内容:

当防火分隔部位的宽度不大于30m时,防火卷帘的宽度不应大于()。 A.10m
B.12m
C.14m
D.16m

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