You need to back up the existing data on a computer before you install a new application. You also need to ensure that you are able to recover individual user files that are replaced or deleted during the installation. What should you do？（） ["Create a System Restore point.","Perform an Automated System Recovery （ASR） backup and restore.","In the Backup and Restore Center window， click the Back up files button.","In the Backup and Restore Center window， click the Back up computer button."]
基金证券
表示报纸产量以及与产量有关的其他统计指标的基本单位是（）
From small business to large-scale enterprises， which two best describe how the Cisco Unified Wireless Network reduces overall operational expenses？ （） [" extends networkQoS throughout the network"," simplifies management of central or remotely located access points"," ensures implementation of the most recent security protocols"," streamlines wireless LAN management"," extends features for optical traffic network service"]
M99表示（）。 ["调用下一个子程序","子程序返回主程序","调用循环","关机"]
在现场测量介损tgσ时，如果试验电源的电压波形不好，含有较大的（）分量，则电桥很难（）。
