创建前面板有3个圆LED的VI。运行程序时，第一个LED打开并保持打开状态。1秒钟以后，第二个LED打开并保持打开状态；再过2秒钟，第三个LED打开并保持打开状态。所有LED都保持打开状态3秒钟，然后程序结束。-Create a round front panel has 3 LED' s VI. Run the program, the first LED to open and keep open. 1 second later, a second LED to open and remain open　another 2 seconds, the third LED open and keep open. All LED are to remain open for 3 seconds, then the program ends.