球、圆柱、圆锥。 球可向任意方向滚动;圆柱以侧面与地面接触,可前后滚动;圆锥以侧面触地,以顶点为圆心滚动画圆。 立体图形: 1、所有点不在同一平面上的...
快要过年了--你最害怕的是什么 New Year\'s Day is just around the corner, and people are getting ready to celebrate the Chinese New Year. As the fes...