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DevExpress 14.1 全部自带图标 16*16 32*32

一个简单的sqlite类，用于sqlite项目快速开发

jQuery 1.8.2 最新版

微软C# OleDbHelper.cs 源码

微软C# OleDbHelper.cs 源码,微软C# OleDbHelper.cs 源码,微软C# OleDbHelper.cs 源码,微软C# OleDbHelper.cs 源码

微软C# OdbcHelper.cs 源码

微软C# SqlHelper.cs 源码

本章介绍数据库的入门知识，首先介绍什么是数据库，然后介绍数据库中的一些基本概念，接着介绍操纵数据库的不同方式，最后介绍操纵数据库时使用的语言SQL，在章节中我们还将穿插一些非常有趣的话题。

华为传输题库，包含各个类型，示例： 1. SDH 的含义是 同步数字传输体制。 2. STM-N 的复用方式是 字节间插 。 3. 2M PDH信号映射入PQ1时，采用的映射方式是 异步映射 。

本套丛书深入浅出的介绍了华为产品的原理、结构、特点和业务性能等，尝试用通俗易懂的语言将复杂的电信网络展现在具有不同知识结构的读者面前。

The purpose of this application note is to describe the main elements of an RS-422 and RS-485 system. This application note attempts to cover enough technical details so that the system designer will have considered all the important aspects in his data system design. Since both RS-422 and RS- 485 are data transmission systems that use balanced differential signals, it is appropriate to discuss both systems in the same application note. Throughout this application note the generic terms of RS-422 and RS-485 will be used to represent the EIA/TIA-422 and EIA/TIA-485 Standards.

The purpose of this application note is to describe the main elements of an RS-422 and RS-485 system. This application note attempts to cover enough technical details so that the system designer will have considered all the important aspects in his data system design. Since both RS-422 and RS- 485 are data transmission systems that use balanced differential signals, it is appropriate to discuss both systems in the same application note. Throughout this application note the generic terms of RS-422 and RS-485 will be used to represent the EIA/TIA-422 and EIA/TIA-485 Standards.

根据可视化楼宇对讲系统的特点 ,介绍了其功能设计、 视频联网方式、 系统布线 ,通过分析准可视方案的应用情况 ,阐明了其设计施工中若干问题的解决措施 ,以适应智能化住宅小区建设发展的需要。

现行二总线制楼宇呼叫对讲系统中，多数系统均采用数字信号进行呼叫、控制，而对讲则直接采用音频模拟信号，侧音大、易产生啸叫成为该类系统的通病。把数字音频技术引入二总线制楼宇呼叫对讲系统中，可设计出高音质、低成本、简单实用的楼宇对讲系统，完全解决了侧音大、易产生啸叫的问题

楼宇对讲系统是楼宇自动化的必备硬件之一,分可视和非可视两种,本文介绍一种已实际应用的非可视对讲系统。

This book has existed (in one form or another) since the first edition of C# and the .NET Platform was published in conjunction with the release of .NET 1.0 Beta 2, circa the summer of 2001. Since that point, I have been extremely happy and grateful to see that this text was very well received by the press and, most important, by readers. Over the years it was nominated as a Jolt Award finalist (Ilost . . . crap!) and for the 2003 Referenceware Excellence Award in the programming book category (I won? Cool!).