毎日一問----------工程基礎知識 シングルクイズ（10月11日）
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参加すれば3の財富報酬がもらえます。単一選択問題：非円形の管において、（ ）は流動断面積の4倍を濡れ周辺で割った値に等しいです。 A 摩擦直径；B 曲がり直径；C 等価直径；D 公称直径。
非円形管の場合、（C）は流動断面積の4倍を濡れ周辺で割った値に等しい。 A 摩擦直径；B 曲がり直径；C 等価直径；D 公称直径。
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