一道是说一个人在自己的球上画了三个圆做记号三个圆都是最大的所以他们的圆心就是球心问三个圆最多和最少有几个交点
一道是说一个人在自己的球上画了三个圆做记号三个圆都是最大的所以他们的圆心就是球心问三个圆最多和最少有几个交点
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