In this dissertation, two problems associated with quality of service are studied.
本文讨论了两个与业务质量有关的问题。
After-sales service: quality problems occur within one year replacement, lifetime warranty.
售后服务：一年内出现质量问题包换，终身保修。
After-sales service: quality problems occur within one year replacement, lifetime warranty.
售后服务：一年内出现质量问题包换，终身保修。
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