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。
在装配图中，剖面厚度在（）以下的图形允许以涂黑来代替剖面符号。 2mm。 3mm。 4mm。 5mm。
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。
金融衍生工具
After you install a new update， an application on the computer fails to run. You need to remove the update. What should you do？（） Use the Software Explorer window.。 Use the Add or Remove Programs window.。 Restore hidden updates.。 Use the Installed updates list on the Windows Update window.。
What three elements are included with Cisco Small Business Pro Service？ （）
