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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

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用8位数码管组成显示电路提示信息，当输入密码时，只显示“8.”，当密码位数输入完毕按下确认键时，对输入的密码与设定的密码进行比较，若密码正确，则门开，此处用LED发光二极管亮一秒钟做为提示，同时发出“叮咚”声；若密码不正确，禁止按键输入3秒，同时发出“嘀、嘀”报警声；若在3秒之内仍有按键按下，则禁止 -With 8-bit digital tube display circuit message, when the input password, only shows "8.", When the median enter password press the confirm button when finished to set the password with the password for comparison, if the password correct, then the door opened here with a bright LED light-emitting diodes as a matter of seconds suggests that at the same time issued a "ding dong" sound if the password is not correct to prohibit the importation of key three seconds, at the same time issued a "嘀,嘀" alarm sound if within 3 seconds press the button there, then the prohibition of

许继综合自动化中采用的最新版通信103规约,，它描述了许继电气公司CBZ8000变电站自动化系统中的继电保护自动化产品的实际运用情况，以供产品的开发和使用参考-Xuji integrated automation used in the latest version of Communication 103 of the Statute, it describes the CBZ8000 Xuji Electric Company substation automation system relay protection of the practical application of automation products to for product development and use of reference

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编译原理的教程和一个实习的例子程序，参考价值高。-compiler principles guide and a practical example of the procedure, the high reference value.

SIP传说是今年最热门的一个通信协议，了解了解，会有很多收获的-SIP legend was one of the most popular communication protocols, understand understanding, there will be many harvest