单选题：某医院综合楼高15层，牙科诊室位于13层的袋形走到一侧，此时该牙科诊室的房间门距离最近安全出口的最大距离不应超过（　　）

题目内容：

某医院综合楼高15层，牙科诊室位于13层的袋形走到一侧，此时该牙科诊室的房间门距离最近安全出口的最大距离不应超过（　　）m A．15
B．20
C．25
D．30

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