猪肉的结冰温度为（）。 ["0℃","-0.5℃","-1.0℃","-1.5～-2℃"]
Which three protocols should be explicitly managed by using a CoPP policy on an Internet border router？（） ["SMTP","ICMP","BGP","SSH","RTP","BitTorrent","VTP"]
刑事侦查情报工作与其他公安工作的纽带是（） ["刑事情报分析","刑事情报利用","刑事情报传递","刑事情报搜集"]
Virtual PortChannels （vPCs） allow links that are physically connected to two different Cisco switches to appear to a third downstream device as coming from a single device and as part of a single port channel. Which of the following are components of a Virtual PortChannel system？ （） [" Two peer devices： the vPC peers of which one is primary and one is secondary and are part of a vPC domain."," A Layer 3 Gigabit Ethernet link called peer-keepalive link to resolve dual-active scenarios"," A redundant 10 Gigabit Ethernet PortChannel called a peer link to carry traffic from one system to the other when needed"," vPC member ports forming the PortChannel"," A dot1q trunk between the vPC peers"," A management port that can be used as peer-keepalive link to resolve dual-active scenarios."]
设备的最优更新期选择，应以设备的费用最小为准，这些费用是指（）。 ["一次性投资","经营费用","修理费用","一次性投资和各年经营费用总和"]
费马原理
