单项选择题
Which cell pattern is recommended to use when using frequency hopping? （）
A.4/12 B.3/9 C.7/21 D.7/7
单项选择题 Which of these is not a prediction model for radio coverage? （）
单项选择题 Which of these assumptions is necessary to use in system balance? （）
单项选择题 What is system balance? （）
