单项选择题
What does Grade of Service (GoS) mean? （）
A. Number of available subscriber services B. Number of unsuccessful call set-ups due to congestion C. Channel utilization D. Number of successful call set-ups E. Number of dropped calls
单项选择题 What type of interference is produced by other transmitters on the same frequency? （）
单项选择题 Which unit is used for measuring traffic? （）
单项选择题 What is the name of the type of fading which is due to shadowing? （）
