溜井发生跑矿事故，正确处理方法之一是（）。 ["查明原因待稳定后处理","查明原因立即处理","查明原因后，从溜井下部进入溜井处理"]
One of your customers has decided to deploy location-based services in addition to existing wireless services. the customer requires that the additional access points to be deployed in monitor-only modE. The most likely reason for this requirement is that the customer has which of these existing wireless devices？（） ["data collection","802.11b\/g voip","802.11b and g clients","rfid tag"]
在高于起始放电电压时，绝缘介质的损耗会随电压的增加而（），因此用测量介质损耗的方法，可以探测设备的局部放电，即所谓测量绝缘的（），但这种方法的灵敏度较低。
The Cisco SA 500 Series Security Appliances are built specifically for businesses with less than 100 employees. What are three important benefits of this device？ （） [" site-to-site VPN for remote offices"," business-grade firewall"," Cisco IOS software-based"," email security"," XML support"," premium support via SMARTnet"]
根据《高新技术企业认定管理办法》的规定，高新技术企业认定必须满足最近三个会计年度研究开发费用总额占销售收入总额一定比例的要求，下列针对具体要求表述错误的是（）。 ["最近一年销售收入小于5000万元的企业，研究开发费用总额占销售收入总额的比例不低于5%","最近一年销售收入在5000万元至20000万元的企业，研究开发费用总额占销售收入总额比例不低于4%","最近一年销售收入在20000万元以上的企业，研究开发费用总额占销售收入总额比例不低于3%","企业在中国境内发生的研究开发费用总额占全部研究开发费用总额的比例不低于60%""]
协方差是衡量两种证券之间（）的一个测量指标，它对证券组合风险起着直接放大或缩小的功能。
