單項選擇題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
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1.單項選擇題What type of interference is produced by other transmitters on the same frequency? （）
A. Double interference
B. Co-channel interference
C. Adjacent channel interference
D. Reflected interference
E. Timing interference
2.單項選擇題Which unit is used for measuring traffic? （）
A. Erlang
B. Bit/second
C. Hertz
D. Subscribers/kHz
E. Subscribers/minute
