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

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

出自：中国移动网络维护生产岗位

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