单项选择题
Which of the following 802.11 standards can operate at both 2.4 GHz and 5.0 GHz?（）
A.A B.B C.G D.N
单项选择题 Which of the following is the correct pin out for T568B?（）
单项选择题 Which of the following is a multimedia device?（）
单项选择题 Which of the following cable types is 68-pin?（）
