grade of service短语⁷⁹⁹⁷⁸⁺⁹ 基本例句 服务等级质量 Three reliability measures of communication networks based on network traffic, namely available probability vector, actual performance vector and grade of service, are proposed in this paper. 本文提出通信网可靠性的基于网络业务性能的三个测度：有效概率矢量，实际性能矢量和全网有效度。 cnki