什么叫呼损率?
单位时间内呼叫成功的次数占所有试呼的次数比例。呼损率也称通信网的服务等级。呼损率越小,成功呼叫的概率越大,服务等级越高。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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