显示方波输入下的RC电路响应曲线，在tc 2.0下编译调试通过。在编译前要将tc环境设置一下，即将图形显示驱动载入到程序中，从而实现程序的独立运行。-Show the square wave input RC circuit response curve, in tc 2.0 compiled under debug through. In the pre-compiler environment settings to tc about upcoming graphics display dr