洁净室空气净化级别分为那几级？（） ["A级","B级","C级","D级","E级"]
If you needed to transport traffic coming from multiple VLANs （connected between switches）， and your CTO was insistent on using an open standard，which protocol would you use？（） ["802.11B","spanning-tree","802.1Q","ISL","VTP","Q.921"]
大卫运约柜的车，到了那艮的禾场，牛失前蹄，伸手扶约柜而死的人是谁？
教育法的基本原则，是指全部教育法所应遵循的基本要求和（），是制定和执行教育法的出发点和基本依据。 ["行为规范","工作标准","价值准则","法律关系"]
动校正
当多个交换机放在同一个MST的region里，what must happen？
