单选题:结构施工自二层起,凡人员进出的通道口都应搭设符合规范要求的防护棚,高度超过( )的交叉作业,应设双层防护棚进行防护。

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题目内容:
结构施工自二层起,凡人员进出的通道口都应搭设符合规范要求的防护棚,高度超过( )的交叉作业,应设双层防护棚进行防护。 A.25m
B.24m
C.20m
D.18m
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