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."]
在进行工频交流耐压试验时，试验的容抗与试验变压器的漏抗是串联的，当回路的自振频率与电源的基波或高次谐波频率相同而产生（）时，在试品上就会产生比电源电压高得多的（）。
简述密码体制的原则：
There are many reasons why customers lack sufficient security measures on the network. Which two reasons for insufficient security are typical of the customers today?（） ["the use of hosted email services eliminating the need for local security","the perceived costs of security solutions","the lack of risk analysis","the lack of threats to their network","the belief that free security tools are sufficient","the desire to avoid unnecessary technologie"]
“格式塔”的意思是（）。
