单项选择题
A.Incorrect printer driver.
B.Printer needs calibration.
C.Dirty printer head.
D.Font settings on the printer.
单项选择题 Wheninstallinganewscanner，WindowsXPdoesnotautomaticallyrecognizethescanner.Whichofthefollowingactionsshouldbetaken？（）
单项选择题 Whenusinganinkjetprinter，auserreportsthatcolorsseemtobemissingintermittently.WhichofthefollowingisMOSTlikelythecause？（）
单项选择题 Ashippingdepartmentisreportingthatalaserprinterinthereceivingareaisbecomingjammedbecausetheprinterattemptstopullseveralsheetsofpaperforeachprint.Whichofthefollowingmaybethecause？（）