单项选择题
A.Replace the printer.
B.Replace print head assembly.
C.Clean the print head.
D.Use a different brand of paper.
单项选择题 Ashippingdepartmentisreportingthatalaserprinterinthereceivingareaisbecomingjammedbecausetheprinterattemptstopullseveralsheetsofpaperforeachprint.Whichofthefollowingmaybethecause？（）
单项选择题 WhichofthefollowingwouldbethemaximumnumberofdevicesinasinglechainthatUSBtechnologywillallow？（）
单项选择题 WhichofthefollowingdesktophardwareshouldatechnicianbeMOSTconcernedwithdisposingofcorrectly？（）