该源程序行有注释，简单易懂，用此程序制作的可调定时闹钟特适合工作比较忙的人群（可定时什么时候输出信号，什么时候关闭信号，时间段多达4个）-The source line annotation, easy to understand, with the adjustable timer alarm clock produced by this program is especially suitable for busy working population (the timing when th