人均粮食产量、人口密度、农民人均纯收入、粮食增产量，这四个指标中属于数量指标的有（）。 ["1个","2个","3个","4个"]
Which feature would prevent guest users from gaining network access by unplugging an IP phone andconnecting a laptop computer？（） ["IPSec VPN","SSL VPN","port security","port security with statically configured MAC addresses","private VLAN"]
控制元件在液压系统中控制和调节液体的（） ["压力","流量","方向","以上均正确"]
国际货物买卖法
You deployed new fibers in your network to replace copper spans that were too long. While reconnecting the network， you experienced network problems because you reconnected wrong fibers to wrong ports. What could you do to prevent this type of problem in the future， particularly when connecting and reconnecting fiber pairs？ （） [" Only use fiber in pairs."," Configure root guard on your switches."," Do not use fiber but use copper."," Configure UDLD to prevent one-way link conditions."]
结构域（domain）
