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倒车雷达只需要在汽车倒车时工作，为驾驶员提供汽车后方的信息。由于倒车时汽车的行驶速度较慢，和声速相比可以认为汽车是静止的，因此在系统中 可以忽略多普勒效应的影响。在许多测距方法中，脉冲测距法只需要测量超声波在测量点与目标间的往返时间，实现简单，因此本系统采用了这种方法。-Reversing radar only need to work in the car when reversing, the rear car for the driver to provide information. As the reversing of vehicles traveling at slower speeds, and speed of sound can be compared to consider car is stationary, and therefore in the system can ignore the impact of the Doppler effect. Ranging in many methods, ranging pulse ultrasonic method only measured in the measurement points and the round-trip time between the target and achieve a simple, this system uses this approach.

坐标系统与地图投影-coordinate systems and map projection

C#打印功能(PrintDialog,PrintDocument）.-C# Print function (PrintDialog, PrintDocument).

1.1 开发文档目的 1． 开发产品的目的是解决Moivehome公司庞大的员工管理和日益壮大的出租影碟业务管理业务。随着公司的壮大，公司使用和产生的数据量日益增大，管理变得非常困难。MovieHome公司数据库应用的目的是维护公司产生的数据，支持面向会员的影像制品出租业务，方便分公司之间的合作和信息共享。要求软件在实现基本的数据信息存贮和数据操作功能外，实现软件的可视化界面和简易操作。 2． 定义需求规格说明书（RS）的目的是：定义总体要求，作为用户和软件开发人员之间相互了解的基础；提供性能要求、初步设计和对用户影响的信息，作为开发人员进行设计和实施的基础；作为总体验证和确认的依据。-1.1 purpose of a development document. Developing products are designed to address large companies Moivehome the staff management and the growing DVD rental business management. With the growth of the company, the company use and the growing volume of data, management has become very difficult. MovieHome company database applications with the aim to safeguard data generated by the company in support of the members of the video-rental business products to facilitate cooperation between the branches and information sharing. The software required to achieve basic data storage and data manipulation functions, the software visualization interface and easy to operate. 2. Definition of requirements sp

斐波那契数列 的问题，感觉不错。，-Fibonacci series, feeling good. ,

给初学者的，希望有用，是51单片机c语言的编程学习，里面讲解清楚，容易上手-To beginners, and I hope useful, is 51 single-chip learning c programming language, which on a clear, easy to use

实现彩色进度条-To achieve the progress bar color

c语言函数大全，方便查询-Daquan, easily accessible

蓝牙l2cap和rfcomm协议分析与实现-l2cap and rfcomm Bluetooth protocol analysis and Implementation

一篇关于a*很好的入门文章-one of a* good entry article