Chinese ancient copper COINS have a square hole inside a circle.
中国古代铜钱的形状是外圆内方的。
The center of circle is the position of the centre hole for positioning.
该圆周的圆心即定位的中心孔位置。
Two circle round hole hammer body through the distance between the meet collision equilibrium condition.
两锤体圆透孔圆心之间的距离满足碰撞平衡条件。
Two circle round hole hammer body through the distance between the meet collision equilibrium condition.
两锤体圆透孔圆心之间的距离满足碰撞平衡条件。
应用推荐