【毎日一問】理論基礎 2019.12.4
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穴埋め問題：非円形の管で、断面がa×bの長方形の場合、その等価直径は（ ）である。 答え：2ab/(a+b)ヒント：解き方の過程を説明できた人には追加の報酬があります。答えは返信で確認できます！
（ab/PI）^0.5
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