单项选择题

Which of the following uses pair authentication to provide a wireless connection between twodevices?（）

A. 802.11n
B. Bluetooth
C. Infrared
D. Cellular

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单项选择题

A. net use
B. telnet
C. ping
D. ipconfig

单项选择题

A. OS loads
B. Safe Mode starts
C. RAM check
D. MBR check

单项选择题

A. 33 Feet (10 meters)
B. 100 Feet (30 meters)
C. 328 Feet (100 meters)
D. 1200 Feet (366 meters)