用两个按钮控制一个LED亮、灭：认识单片机的按钮输入，单片机教程：http://www.ipbb.cn,相对于电力拖动线路中的电动机单向连续运行电路-With two buttons to control an LED on and off: understanding the button input of the microcontroller, the microcontroller tutorial: http://www.ipbb.cn phase lines for the elec