单选题:当信息机房进深大于()时,应在机房两侧设置公共走道,并在走道上设置室内消火栓系统。

题目内容:

当信息机房进深大于()时,应在机房两侧设置公共走道,并在走道上设置室内消火栓系统。 A.15m
B.20m
C.25m
D.30m

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