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所有的圆是否都相似?答案是肯定的;所有的椭圆(或双曲线)是否都相似?答案是否定的;那么,所有的抛物线是否都相似呢?也许你会不加思索地回答:不相似.是这
Is all the circles similar? The answer is yes; whether all ellipses (or hyperbola) are similar? The answer is no; then, are all the parabolas similar? Maybe you will answer without thought: dissimilar .This is