单项选择题
A.Download free anti-virus programs from the Internet.
B.Perform updates from the manufacturers website regularly.
C.Using the operating systems email program only to open attachments.
D.Monitoring what is displayed on the screen.
单项选择题 WhichofthefollowingRAIDconfigurationstakesadvantageofmirroring？（）
多项选择题 Whichofthefollowingshouldbeconsideredwhenupgradingmemory？（）
单项选择题 Auserreportsthatwhentryingtoprintadocumentnothingcomesoutoftheprinterandstatesthattheonlyprinterintheprinterdialogboxis’MicrosoftOfficeDocumentImageWriter.’Thetechnicianshouldunderstandthattheproblemisthattheprinter：（）