【单选题】
垂直防火分区,就是用具有___耐火极限的楼板和窗间墙(两上、下窗之间的距离不小于2m)将上下层隔开。
A. 2h或2.5h
B. 1.5h或2h
C. 1h或1.5h
D. 0.5h或1h
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答案
D
解析
暂无解析
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下列关于消防头盔佩戴方法说法错误的是___。
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Which information can you display by executing the show crypto ipsec sa command?___
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