这是双频测心率法的原理文档，做该项目时很有帮助
This is the dual principle of measuring heart rate law documents, the project is helpful to do (2011-05-27, Windows_Unix, 2855KB, 下载6次)
最先进的车载娱乐影音系统.是专门为汽车前端市场开发的.
The most advanced audio and video car entertainment system. Is designed for automotive front-end market development. (2010-04-02, Windows_Unix, 457KB, 下载14次)