单选题:地铁车站公共区吊顶与其他场所相连通部位的顶棚或吊顶面高差大于(  )时,该部位可不设置挡烟垂壁。

题目内容:
地铁车站公共区吊顶与其他场所相连通部位的顶棚或吊顶面高差大于(  )时,该部位可不设置挡烟垂壁。 A.200mm
B.300mm
C.500mm
D.750mm

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