单项选择题
A. CPU B. USB capacity C. Optical drive D. RAM
Which of the following connection types use a phone lin...
多项选择题Which of the following connection types use a phone line as a carrier to provide access to theInternet?（）
A.Cellular B.Satellite C.ISDN D.WiMAX E.DSL
Which of the following is included in the typical laser...
多项选择题Which of the following is included in the typical laser printer maintenance kit?（）
A. Print head B. Toner C. Fuser D. Main drive assembly E. Pickup rollers
A laser printer prints pages with a gray background. Wh...
单项选择题A laser printer prints pages with a gray background. Which of the following is the MOST possible cause of the problem? （）
A.Transfer roller B.Paper type C.Print head D.Fuser
