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    Steradian.SI立体角測定。シンボル：sr。それは面積が球の半径の 正方形に等しい表面の一部によって範囲を定められた球の立体角度である。もう１つの定義は、球の中心に頂 点を持つ立体角度で、球の半径に等しい長さの...^

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