本文主要介绍了变频器在国产单双色单张纸平版印刷机改造中的应用，以及对变频器的一些功能的要求。
The paper introduces the application of inverter in the reform of homemade single - double-color singleton paper lithography machine, followed with some functional demands for inverter.
文中介绍了利用单张航摄像片制作正射影像图的几种典型方法，并给出了它们的算法实现，最后作了简单的对比分析。
In the paper, several typical ways in this respect are introduced and their algorithmic realization are given, furthermore, a simple comparison and analysis are also made.
二是配套服务不健全：除了大昭寺有一张景点介绍的小单张可以免费派送之外，其他景点的简介都得另外掏钱购买；
Reason two, tourism facility is not well facilitated: except in Jokhan Temple there is a introduction brochure for free distribution to visitors, any other sights are requested to pay for it;
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