两个圆环,半径分别是一和二小圆在大圆外部绕大圈混动一�,小圆自转了几�? 知乎 Template




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tomski两个圆环,半径分别是一和二小圆在大圆外部绕大圈混动一�,小圆自转了几�? 知乎 coloring