程序功能 ： 蜂鸣器实验 为了有更多实用的实验程序供大家学习，部分程序参考网上的资源，在此谢谢这些无私奉献的朋友！！！ -Program features: buzzer experiment in order to have more practical for them to learn from the experimental procedures, some of the procedures refer to online resources, would like to th