C、防烟排烟风机应全部检验,通风空调和防排烟设备的阀门,应按实际安装数量10%-20%的比例抽验
<span style='display: inline !important; float: none; background-color: transparent; color: rgb(0, 0, 0); 微软雅黑","helvetica neue","hiragino sans gb"; font-size: 14px; font-style: normal; font-variant: normal; font-weight: 100; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;'>A错误,因为各类消防用电设备主、备电源的自动转换装置,应进行3次转换试验,每次试验均应正常。B项错误,因为电动防火门、防火卷帘,5樘以下的应全部检验,超过5樘的应按实际安装数量20%的比例抽验,但抽验总数不应小于5樘。D项错误,因为电梯应进行1~2次联动返回首层功能检验,其控制功能、信号均应正常。<span style='display: inline !important; float: none; background-color: transparent; color: rgb(0, 0, 0); 微软雅黑","helvetica neue","hiragino sans gb"; font-size: 14px; font-style: normal; font-variant: normal; font-weight: 100; letter-spacing: normal; orphans: 2; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: normal; word-spacing: 0px;'>本题答案:C。