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"]
学生通过参与体育运动，克服不利因素和消极情绪，从而获得战胜困难的信心和力量，是属于提高社会适应能力中的（） ["抗挫折能力","遵守行为规范的能力","适应社会角色转变的能力","提高竞争意识的能力"]
柴油机有敲击声的原因有哪些？
奶油生产时，杀菌温度控制在80-85℃，目的主要在于破坏（）的活性 ["磷酸酶","解脂酶","过氧化物酶"]
ZXMP-S385在硬件上采用冗余设计，对业务总线、开销总线、时钟总线采用双总线的结构体系，对重要单板进行1＋1热备份保护，以提高系统的可靠性和稳定性进行热备份保护的部分包括（） ["时钟板SC","交叉板CS","电源模块","光线路处理板OL16"]
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