无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

單項(xiàng)選擇題

A particular cell is expected to support 6 Erlangs of traffic at 1% Grade of Service. How many traffic channels are required?()

A. 6 
B. 13 
C. 3 
D. 15 
E. 22

微信掃碼免費(fèi)搜題