测量一个信号的电压值（可用随机数发生器模拟）并进行滤波处理，以前3点的平均值作为滤波方法，要求共测量30个点，不仅要显示出实际的信号波形，同时还要显示滤波后的信号波形(The voltage value of a signal is measured (with a random number generator simulated) and filtered. The average value of the previous 3 points as a filtering method re