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 the output signal, when to turn off the signal, the time period of up to 4)