单选题:从一个防火分区内的任何位置到邻近的手动火灾报警按钮的步行距离不应大于()。

题目内容:

从一个防火分区内的任何位置到邻近的手动火灾报警按钮的步行距离不应大于()。 A.10m
B.15m
C.20m
D.30m

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