进度栏的应用。用timer()组件来控制时间，进度栏模拟活动的进度。-progress column applications. Using timer () components to control the time, the progress of the simulation column progress.

进度栏的应用。用timer()组件来控制时间，进度栏模拟活动的进度。-progress column applications. Using timer () components to control the time, the progress of the simulation column progress.