试论选择与应用教学方法的原则。
乳中掺水1％，冰点约上升（） ["0.054℃","0.0054℃","0.54℃"]
Your company is researching a new application that runs over IPv6，but part of it must still have IPv4 support. Your company uses a traditional IPv4 network. Your plan is not to run IPv6 over the whole network，but to segment parts of the network or even to operate simultaneously with IPv6 and IPv4. You must make a brief presentation about IPv6 technology to the board of technical directors. Which three of these items could be part of your presentation？ （） ["Tunnel IPv6 over IPv4 to connect far-end IPv6 networks.","Explain why configuring IPv4 and IPv6 at the same time over the same LAN interface is not possible.","Explain why configuring IPv4 and IPv6 at the same time over the same LAN interface is possible.","What is the meaning of EUI-64 and how does it work？","Tunnel IPv4 over IPv6 to connect far-end IPv4 networks."]
危机事件的特征是（）。 ["突发性","紧急性","危害性","关注性"]
机油泵主动轴孔磨损超过（）时，可用修理尺寸法加以修理。 ["O.05mm","0.02mm","O.15mm","0.25mm"]
波分系统有开放式、半开放式、集成式应用，请说明其区别。
