3,5,7 magic square magic square can be reflected

超声波测距的原理图。9个按键，一个液晶。-Ultrasonic Ranging schematic. 9 buttons, a liquid crystal.

RTC时实时钟的ARM描述-RTC clock when the ARM real-time description of

学术论文的撰写规范与要求. 希望帮助大家完成标准的论文写作.-academic writing norms and requirements. We hope to help complete the standard of academic writing.

本文分别深入讨论了C++与Java的异常处理机制。比较了C++与Java的异常匹配处理，异常类继承体系与异常处理代码的区别，并且讨论了异常对象的生存周期与存储方式。最后，在其基础上构想了异常处理机制的发展方向。 -In this paper, in-depth discussion of the C++ and Java exception handling mechanism. Comparison of C++ and Java exceptions match the handling, exception class inheritance system and the difference between exception handling code, and discussed the life cycle with the exception object is stored. Finally, based on the idea of exception handling mechanism of development direction.

用C＃实现调用外部程序，方便程序间的互相切换。-C# realization call external procedures to facilitate the process of switching each other.

software engineering

可以获取版本信息的应用派生类-version can access information and the use of derivatives category

此文件2006年全国建模大赛A题的优秀论文-This document is the National Model Competition in 2006 titled A good thesis

一些RFID的文章，分为5个文件这是前4个，希望对这一领域的研究有帮助

SHA加密算法是目前广为应用的重要加密方法之一。而SHA-1 生成 160 位的消息摘要，虽然执行更慢，却被认为更安全。明文消息的最大长度可达到 264 位。下面是网络上流传的SHA算法，我们自己调试了一下，已经通过。现把主函数和算法函数贴出来。-SHA encryption algorithm is an important widely used encryption methods. And SHA-1 generates the message digest 160, although more slowly, but think more secure. Explicit messages the maximum length could reach 264. The following is a network spread SHA algorithm, debugging a bit of our own has passed. Are the main functions and algorithms function posted.