In this paper, the problems met in designing, producing and use of the rotary-vane vacuum pump are discussed. The solution methods and the research direction are given.
本文论述了旋片真空在设计、生产和使用中存在的问题，提出了解决的方法和研究方向。
The paper mainly makes research of Core J2EE patterns. It discusses the reusable solution way of designing and developing on J2EE platform. Each of patterns has own scope of application.
论文主要研究了典型J2EE核心模式，它提供了在J2EE平台上设计和开发的可重用解决方案，并且每种模式都有各自的适用范围。
Finally, this text combines preceding research through an analysis of land network current situation of broadband city, bear the weight of the solution of the network after designing IPTV.
最后，本文通过对宽带城域网现状的分析，结合前面的研究，设计了IPTV承载网解决方案。
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