单项选择题
Which of the following failed components would be responsible for the fuser unit not heating properly？（）
A.Halogen lamps B.Ball bearing C.Hot roller D.Pressure roller
单项选择题 Whichofthefollowingdevicescanrouteelectricalsignalsonlywhenactivatedbyanexternalcontrolsignal？（）
单项选择题 WhichofthefollowingistheFIRSTstepatechnicianshouldtakewhentroubleshootingadeviceissue？（）
单项选择题 Howshouldaservicerepresentativeprovideclosureattheendofacallforaclient？（）
