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异步电动机控制系统（VVVF系统）频率测量三相异步电动机的基本控制方式定子截面的均方根是电动势

电信VOIP计费系统方案,在全国各地应用.-VOIP Telecom Billing System program, the application throughout the country.

功能见文档：综合地运用所学的 《数字逻辑》的基本知识，使用电脑EWB仿真技术，独立完整地设计一定功能的电子电路。-function see Document : Comprehensive land use study of the "digital logic" of basic knowledge, EWB use of computer simulation technology, independence and integrity to the design of certain functional electronic circuit.

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文中介绍一种不用光耦就可以实现隔离的方法-This paper introduces an optocoupler can be achieved without isolation method

Device Class Definition for Physical Interface Devices (PID)

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随着现在社会的发展，人们都避免不了要到某些城市去公干或其他的事情。一旦你对这个城市不熟悉，你的出门就会举步维艰。打的，对于一些因公出差的人来说算不了什么，但是对于旅游者或是个人来说就不是很好的选择。-now with the development of society, people should not have to avoid certain cities for business or other matters. Once you are not familiar with this city, you will be difficult to leave home. Fight, some on official business who is nothing, But tourists or individuals is not a good choice.

Windows的资源管理器想必大家都用过，该程序的窗口一分为二，左边的窗口显示本机当前所有驱动器以及驱动器中的所有文件夹，当用户单击文件夹后，如果该文件夹下面还有子文件夹，则上层文件夹展开显示下级的文件夹；否则，右边的窗口显示选择文件夹下的文件。该文档提供了实现方法。-Windows resource manager must have all used, the procedure is divided into two one window. The left window shows the current machine and all Drivers Drivers of all folders when users click the folder, If the folder Read Documents folder, the folder launched upper and lower levels show the folder; Otherwise, the right to choose a window shows folder of documents. The document provides a method.