Which of the following are benefits of VLANs?（） [" They increase the size of collision domains."," They allow logical grouping of users by function."," They can enhance network security."," They increase the size of broadcast domains while decreasing the number of collision domains."," They increase the number of broadcast domains while decreasing the size of the broadcast domains."," They simplify switch administration."]
客户分析是客户关系管理的首要环节，其关键是分析客户的（） ["终生价值","潜在价值","历史价值","当前价值"]
不间断的持续运动一定距离或时间的训练，是一种受欢迎的心肺锻炼方法，称之为（） ["间歇训练","重复训练","持续训练","高原训练"]
WBA（固定增益23dB）的单波长输入光功率为-18dBm，那么当所上波长数为4波时，WBA的输入光功率为（） ["-16dBm","-12dBm","-10dBm","-15dBm"]
当multicast启用pim sparse-mode，但是没配置auto-rp，你将用什么方法？
适应重金属胁迫的植物有哪几种情况？
