频率计 基于单片机的频率计 非常实用 可以作为小制作，供广大单片机爱好者参考-it is very useful and it is very useful and it is very useful and it is very useful and it is very useful and it is very useful and

此程序是使用MFC制作的简单的打字小游戏-This program is made simple with MFC typing game