第21题: [单项选择]下列是超高层建设项目有关避难层的设置原则,( )是不正确的。 A. 建筑高度超过100m的公共建筑应设避难层 B. 自高层底层至第一个避难层或第二个避难层之间不宜超过15层 C. 避难层的净面积宜按5m2/人计算 D. 避难层的上下楼梯不能同层错位或上下层断开 参考答案:D 答案解析:[解析] 通向避难层的防烟楼梯应在避难层分隔、同层错位或上下层断开,但人员均必须经避难层方能上下。
第24题: [单项选择]His first attempt failed, __________. A. his second attempt did either B. so did his second attempt C. neither did his second attempt D. so his second attempt did 参考答案:B