在文档中显示一个不断闪烁的字符，用到了计时器和图形变成方面的知识-in the document shows a constantly blinking characters used in the timer and graphics into the knowledge

交通灯控制系统 模拟显示两组信号灯，每组为直行和左转红黄绿六个信号灯，一组控制东西方向，一组控制南北方向，每组各有一个计时器。-Traffic light control system simulation show that two groups of lights, each for straight and turn left six red, yellow, and green lights, a group of control of an east-west direction,