1）可以实现绘出KockSnow 的任意阶数的图形 2）可以拾取该图形，在黑屏上会显示snow则表明成功拾取该图形，否则什么也不显示 3）可是拖动该图形-1) KockSnow can draw any graph of order 2) can pick up the graphics, the snow will be displayed on a black screen indicates a successful pick up the graphic, otherwise n