The article analyses the difficulty and theory of realizing the on-line upgrade, develops a set of system that can be used repeatedly, with practical reference value and realistic signification.
分析了在线升级的困难及实现原理，提出了一套可重复利用的实现在线升级的系统，具有实际参考价值和现实意义。
The study methods of this article also has good extension meaning and reference value, hence would have much theoretical study signification for related similar researches.
本文的研究方法对于类似的研究有良好的延展性和借鉴性，具有较大的理论研究价值。
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