单项选择题
A. The network cable is disconnected
B. The PS/2 connectors are switched
C. The USB connectors are switched
D. The hard drive is unplugged
单项选择题 Windows XP mode on a Windows 7 Professional machine fails to load. Which of the following isMOST likely the cause?（）
单项选择题 A single office with five computers and a server is an example of which of the following?（）
单项选择题 During which of the following phases of the imaging process is the latent image exposed to toner?（）