单项选择题
A. No IP address on the printer
B. Paper jam in the paper feed tray
C. Improper DNS settings on the printer
D. Broken LCD screen on the printer
单项选择题 A technician plugs a USB device into the front panel of a desktop computer and nothing happens.The technician knows that plug-n-play is enabled. Which of the following BEST describes a possible cause to this issue?（）
单项选择题 Which of the following commands will be run at a command prompt to determine which WindowsOS is running on the computer?（）
单项选择题 An executive’s laptop screen has been damaged and will not power on. Which of the following is the FASTEST way to get the executive back online?（）