Service Level Agreement
通信服务中的基础服务
https://www.jianshu.com/p/f7fe54613587
https://blog.csdn.net/weixin_43970890/article/details/100561678
https://baike.baidu.com/item/%E6%9C%8D%E5%8A%A1%E7%AD%89%E7%BA%A7%E5%8D%8F%E8%AE%AE/20861172?fr=aladdin
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