计数器用一个开关K控制，当K=1时，可逆加法计数器进行计数，K=0时可逆减法计数器进行计数，即可构成一个具有清零和预置功能的可逆加减法计数器-counter with a control switch K, K = 1, the reversible addition counter for counting, K = 0 reversible subtraction counter for counting, with constitutes a reset and preset functi

Following the development of network and communication technology, traditional telecommunication network meets with great challenges currently. In order to overcome the disadvantages of traditional telecom network, next generation network was put for

一个基本的网关切换程序（XP/2003下使用）适合具有2条宽带的网吧使用，时间仓促，网关地址在程序里设置没有单独的配置这是个弊端。-a basic gateway switch (Advanced use) for two with a broadband Internet use, lack of time, Gateway address the program is no single set of configuration it is ills.