说明：  车载项目的单片机程序，熟悉的一看就知道，程序已用于具体项目，单片机+SIM300+GPS。简单修改一下就是另一款产品。
(The vehicle project SCM procedures, familiar to see that, the program has been used for specific projects, microcontroller+SIM300+GPS. Simple modification is related to another.)