单项选择题
A. The mouse has a PS/2 connector which is not hot-swappable.
B. The mouse roller ball is now too smooth to gain traction.
C. The mouse was broken before the user unplugged to clean it.
D. The mouse has a USB connector that is not getting enough power.
单项选择题 Which of the following utilities would be used to configure energy saving measures when a laptop switches to battery power?（）
单项选择题 On a Windows XP machine, which of the following settings should be configured to allow draggingof files without holding the mouse button?（）
单项选择题 What is the MINIMUM Windows Experience Index recommended for using Aero enhancements in Windows 7?（）