What are two reasons a network administrator would use CDP?（） [" to verify the type of cable interconnecting two devices"," to determine the status of network services on a remote device"," to obtain VLAN information from directly connected switches"," to verify Layer 2 connectivity between two devices when Layer 3 fails"," to obtain the IP address of a connected device in order to telnet to the device"," to determine the status of the routing protocols between directly connected router"]
根据鲍林（Pauling）规则，离子晶体MX2中二价阳离子的配位数为8时，一价阴离子的配位数为（）。 ["2","4","6","8"]
Which two statements are true about the implementation of QoS？（） ["Implementing DiffServ involves the configuration of RSVP.","Implementing IntServ allows QoS to be performed by configuring only the ingress and egress devices.","Implementing IntServ involves the utilization of RSVP.","Traffic should be classified and marked by the core network devices.","Traffic should be classified and marked as close to the edge of the network as possible."]
选择是育种工作中一个最基本和有效的手段，通过选择能产生新基因，增加水产动物某一种群内具有育种价值的基因频率，降低育种所不需要的基因频率。
新课改理念下小学阶段课程以（）为主。 ["综合课程","分科课程","分科课程与综合课程相结合","综合实践活动"]
合作
