发生旅客人身伤害人数较高时，应该封锁事故现场禁止与救援调查无关的人员进入。（）
罗马文学的“黄金时代”出现在（）统治时期。 ["凯撒","庞培","安东尼","屋大维"]
A virtual port channel （vPC） allows links that are physically connected to two different Cisco Nexus devices to appear as a single port channel to a third device. Which are the mandatory steps for configuring vPC？ （） [" Enable feature vPC"," Define domains"," Establish peer keepalive connectivity"," Create a peer link"," Configure the peer link as a trunk port"," Create port channels and vPCs"," Define port channel load-balancing method"," Make sure configurations are consistent"]
纲目体
哪个设备会被选为根桥？
柴油机有敲击声的原因有哪些？
