边长分别为3、4、5的三角形的内切圆半径与外接圆半径之比为（

边长分别为3、4、5的三角形的内切圆半径与外接圆半径之比为（）

A．1：5 B．4：5 C．3：5 D．2：5

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边长分别为3、4、5的三角形的内切圆半径与外接圆半径之比为（

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