This article research content and research results mainly includes following parts: Phononic crystals new sound insulating material standing wave tube test modelling.
本文主要研究内容及成果如下：声子晶体新型隔声材料驻波管测试建模。
Through the above several parts of designs, it has completed this article research content, and has built the foundation for further research of the laser warning system.
通过以上几部分的设计，完成了本文的研究内容，并为激光告警系统的进一步研究打下了基础。
The main content of this article is the research on the theory and methods of EIS success evaluation and the construction of new evaluation system and operation method.
本文主要研究了企业信息系统成功评价的理论和方法，并以实际案例为背景进行了信息系统项目成功评价的尝试。
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