单项选择题
A.toner
B.laser beam
C.developer
D.ribbon
单项选择题 Whenexperiencingvideoproblems，whichofthefollowingshouldbeperformedFIRSTtoensurethatthemonitorisnotcausingtheproblem？（）
单项选择题 WhenrebootingacomputerrunningWindowsXPHome，atechnicianobservesanerrormessagestating，“illegalI/Oportaddress.”Whichofthefollowingcanbedonetoresolvethiserror？（）
单项选择题 Whichofthefollowingwouldbeanexampleofabiometricdevice？（）