In which NAS operating mode are ACL filtering and bandwidth throttling only provided during posture assessment？（） [" Layer 2"," Layer 3"," in-band"," out-of-band"," edge"," central"]
邮政企业投递邮件的方式有哪些？
What are the two reasons for the appearance of 0.0.0.0 as the next hop for a network in the show ip bgp command output？（） ["The network was originated via redistribution of an interior gateway protocol into BGP","The network was defined by a static route","The network was originated via a network or aggregate command","The network was learned via EBGP","The network was learned via IBGP"]
某数据库中有员工数据E、产品关系P、仓库关系W和库存关系I，其中：员工关系E（emlpoyeeID，name，department）中的属性为：员工编号，姓名，部门；产品关系P（productID，name，model，size，color）中的属性为：产品编号，产品名称，型号，尺寸，颜色；仓库关系W（warehouseID，name，address，employeeID）中的属性为：仓库编号，仓库名称，地址，负责人编号；库存关系I（warehouseID，productID，quantity）中的属性为仓库编号，产品编号和产品数量。若要求仓库关系的负责人引用员工关系的员工编号，员工关系E的员工编号、仓库关系W的仓库编号和产品关系P的产品编号不能为空且唯一标识一个记录，并且仓库的地址不能为空，则依次要满足的完整性约束是什么？
关于流行性感冒下列哪项是错误的（） ["甲型流感易发生变异","由流行性感冒病毒引起","临床表现以上呼吸道症状较重","发热及全身中毒症状较重"]
简述收集教育媒体教材的渠道。
