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好群（www.howqun.com）是JOYISTAR INC推出的一款面向群组话题讨论的即时通讯工具，用来满足好友间进行群组话题（帖子/主题式）式交流。帮助我们认识有同样兴趣的陌生人,建立基于兴趣的人脉关系的社交软件。 【功能介绍】 [动态] 可以随时接收和查看你所关注的群内话题，重要的话题内容随...
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Ray Tools: Inverting Operational Amplifier Simulat
Solving Operational Amplifiers is straightforward but can become complicated without much effort. This calculator is designed to help simplify your ca...
Ray Tools: Exponential Equations
Understanding exponential equations can be daunting task but this program simplifies understanding. Both from an educational standpoint where the stud...
Ray Tools: Gear Design
Solving a Spur Gear Design problem is straightforward but can become complicated without much effort. This simulator is designed to help simplify your...
Ray Tools: AC Input Operational Amplifier Simulato
Solving Operational Amplifiers is straightforward but can become complicated without much effort. This simulator is designed to help simplify your cal...
Ray Tools: AC Impedance Simulator
Solving Ohms law for DC (E=I*R) is straight forward but what about AC. For AC (E=I*Z) looks simple but the value Z is composed of an inductor (a coil ...
Ray Tools: 555 Timer
The LM 555 timer chip is a special application device used for timing applications. This program can be used to design four different timer circuits, ...