单项选择题
A.Shutdown， restart and verify that the BIOS recognizes the drive and try again.
B.Replace the CD/DVD drive.
C.Pry the tray open with a small， flat head screwdriver.
D.Place the end of a paper clip in the emergency eject pinhole on the CD/DVD drive.
单项选择题 Atechnicianreceivesanewprinterforrepairandtheworkorderstatesthatwhenpoweredontheprintermakesaloudnoiseandwillnotprint.Whichofthefollowingactionsshouldthetechniciantake？（）
单项选择题 Alaserprinterhasaverticallyrepetitiveprintdefect.Beforeattemptingtorepairtheprinter，atechnicianshoulddetermine：（）
单项选择题 Atechnicianreceivesadotmatrixprinterforrepairandtheworkorderstatesthattheprinterisonlyprintingone-halfofeachcharacter.Whichofthefollowingshouldthetechnicianreplace？（）