本公司为客户专业设计、安装各等级洁净车间，质量可靠，服务一流，价格合理。
The Company customers professional design, installation workshop grades clean, reliable, quality service at reasonable prices.
分析了考虑切换优先并采用预留保护信道法的无线系统的性能，提出利用一个综合阻塞率和掉线率这两个性能指标的系统服务等级变量作为系统服务质量的指标。
For blocking rate and dropping rate are two discrepant variables, we propose a variable of service grade that integrates the two variables as metrics for system service quality.
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