单项选择题
A. Out-of-date BIOS
B. Invalid motherboard jumper settings
C. Failing power supply
D. Floppy disk in the drive
单项选择题 Which of the following switches in Windows can be used to ping a host until stopped?（）
单项选择题 A technician installs a local web server which is not accessible from the network. Which of the following is the local IP address that the web server should be using on the loopback adapter?（）
单项选择题 Which of the following is a graphical enhancement in Windows Vista?（）