单项选择题
A.21 B.25 C.80 D.110
Which of the following keys is pressed to enter the Win...
单项选择题Which of the following keys is pressed to enter the Windows boot options after POST?（）
A.F1 B.F8 C.F10 D.F12
A networking device that sends packets to all connectio...
单项选择题A networking device that sends packets to all connections is a:（）
A. gateway. B. hub. C. switch. D. router.
A technician is servicing a customer’s color laser prin...
单项选择题A technician is servicing a customer’s color laser printer and notices excess toner in the printer.Which of the following tools would BEST assist the technician in removing the excess toner?（）
A. Damp towel B. Compressed air C. Alcohol wipe D. Computer vacuum
