How are IP multicast IGMP entries synchronized between vPC peers？（） [" IGMP is not synchronized between vPC peers"," Cisco Fabric Service carries IGMP entries across the vPC peer link"," IP ARP synchronization under the vPC domain configuration also synchronizes IGMP"," IGMP is flooded to the L2 domain， and there is no need to synchronize it between vPC peer"]
语言理解
简述现代学校制度的内涵。
乘务组的主要工作是：（） ["通告站名","及时妥善安排旅客座席、铺位","组织旅客安全乘降","宣传安全常识"]
提升速度超过3m/S的提升系统，必须装设（） ["防坠器；","屈服极限；","延伸率；","断面收缩率"]
美国课程专家麦克尼尔（J.D.McNeil）将课程实施的策略分为三种：（）、（）、（）。
