单项选择题
A.Developer unit
B.Scanner unit
C.Fuser unit
D.Laser unit
单项选择题 Acustomerisconcernedaboutexcessivemediajammingintheirdevice.WhichofthefollowingistheFIRSTthingatechnicianshouldcheck？（）
单项选择题 Thepropersafetyguidelinesforhandlinganydevicespecificconsumablescanbefoundinwhichofthefollowingdocumentation？（）
单项选择题 Whichofthefollowingcomponentsispartoftheinkdispersionsystem？（）