單項(xiàng)選擇題A subscriber makes a two-minute call and a four-minute call during the busy hour. How much traffic does he generate for that hour? （）
A.33 millierlangs
B.66 millierlangs
C.100 millierlangs
D.10 millierlangs
E.25millierlangs
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1.單項(xiàng)選擇題Reusing frequencies in a cellular pattern (compared to “one big cell”)（）
A. Increases channel utilization, cost ,and interference.
B. Increases capacity and cost, but decreases interference.
C. Increases capacity, but decreases cost and interference.
D. Increases capacity, cost, and interference.
2.單項(xiàng)選擇題Which cell pattern is recommended to use when using frequency hopping? （）
A.4/12
B.3/9
C.7/21
D.7/7
