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    Radian.这是国际单位制量度平面角度的单位，符号：rad。它是在圆上所切出 的圆弧长度等於半徑時的圓心角；另一个定义是：圆周的两个半径之间的平面角，在圆周上切除长度等于半径的弧。 Radian = m/m...^

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