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One of the first occurrences of computer technology occurred in the USA in the 1880s. It was due to the American Constitution demanding that a survey is undertaken every 10 years. As the population in the USA increased, it took an increasing amount of time to produce the statistics. By the 1880s, it looked likely that the 1880 survey would not be complete until 1890. To overcome this, Herman Hollerith (who worked for the Government) devised a machine which accepted punch cards with information on them. These cards allowed a current to pass through a hole when there was a hole present.

thunder电子书,请大家相互学习,谢谢!-thunder eBook, please learn from each other, everybody, thank you!

ccna的学习笔记，有一定的学习价值，Cisco 网路设备之设定与管理-the study notes that there is a definite learning value, the Cisco network equipment and management set

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本书内容:第一部分 总则 第一章 电脑维修的基本原则和方法 第二章 电脑维修步骤与维修操作注意事项 第二部分 常见故障判断 第一章 加电类故障 第二章 启动与关闭类故障 第三章 磁盘类故障 第四章 显示类故障 第五章 安装类故障 第六章 操作与应用类故障 第七章 局域网类故障 第八章 Internet类故障 第九章 端口与外设故障 第十章 音视频类故障 第十一章 兼容类故障 第三部分 附录 硬盘基本知识 挽救硬盘的几个方法 硬盘逻辑锁巧解 WINDOWS蓝色当机画面解读 win2k注册表终极修改 下载影片修复合成全供略 IE5.X@6.0选项控制大全 实用的端口大全(中文版) -contents of the book : the first part of the first chapter general computer maintenance basic principles and methods of the second chapter computer maintenance operation and maintenance steps to note the second part of common fault judgment-- the first increase in Chapter category Fault start with the second chapter closed the third chapter category fault disk failures fourth category in Chapter 5 Chapter fault installation category Fault Chapter VI of the operation and application of Chapter VII category Fault LAN Fault category of Chapter VIII of Internet category fault Chapter IX port peripherals fault with the 10th chapter Music Video category fault Chapter 11 compatible Fault third category dr

30个有意思的c#小程序-30 Interestingly, a small c# program

德仪官方网站上的msp430系列的详细介绍，msp430开发者必备。-Official website of Texas Instruments MSP430 series of detailed introduction, msp430 developers must.

《Win2000维护和管理》-"Win2000 maintenance and management"

vc++图像功能非常有用的说明和例子

javascript开发电子书 这是一本javascript开发人员的很好的参考书-electronic books javascript This is a javascript development of good The reference books