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圓,平行四邊形
不是,中心對稱是要把一個圖形繞著某一點旋轉180°,旋轉後能與這個圖形重合.你可以想一下,正三角形一個角向上,旋轉180°後這個角會朝下,肯定不能和原來的圖重合.
不是,因為它只要旋轉120度就行了
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