论述班主任的素质要求。
护面墙的主要作用是（） ["防护土质边坡","防护较质岩石边坡","防护土质及岩石边坡","加固边坡防止塌方"]
股份回购的方式有（）。 [" 建立ESOP"," 买股期权"," 用现金、票据支付"," 卖股期权"]
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."]
铁路的标准轨距为（）毫米。 ["1000","1345","1435","1534"]
试论选择与应用教学方法的原则。
