【单选题】有效的行政行为非依法不得随意变更或者撤销,这是行政行为的( )。
【判断题】敷设在竖井内和穿越不同防火区的桥架,按设计要求位置设置防火隔堵措施,防火分区隔墙两侧的风管防火阀,距墙表面不应大于300mm。
【单选题】在重复保险情况下,我国目前采用的分摊方式是( )
【单选题】敷设在竖井内和穿越不同防火区的桥架,按设计要求位置设置( )措施。
【简答题】A.The temperature dropped below freezing. B.It was very cold. C.It was mildly cold in the early winter last year. D.It was very cold during Christmas time.