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Events are similar to triggers and are started when something happens. When a statement is started on the database, the trigger is started, and the event is started according to the scheduled event. Because they are similar to each other, events are also called temporary triggers.For the operation and maintenance phase, BIM technology can be used to realize virtual reality, asset statistics, space management, building system analysis and disaster emergency simulation. BIM model can improve the efficiency of operation and maintenance, reduce costs, improve the service life of subway and avoid operation and maintenance risks.手托着下巴，一双明亮清澈的眸子看着陈启。Reference: QQ Flying Car-Baidu Encyclopedia一九四四年六月，日寇集中约十万兵力并调集了大批部队攻打江城和屠杀城里的百姓。为了狙击日寇的进攻，夺取鬼子的密电码和行军部署，地下党员柳敬春奉命带领突击小队与国军的三十人小分队联合执行任务。经过追踪侦察，小分队终于确认了鬼子的运输路线，柳敬春（徐僧饰）决定立即行动。这次的行动部署周密、精确，完全可称之为一次经典的突击行动。但是，行动一开始，小分队却陷入敌人的包围，遭受重创，显然队伍里出现了叛徒。只看到片刻之后，少女脸上再次浮现起强烈的害羞。