工芸基礎知識（単一選択問題）20171129
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以下のポンプのうち、インペラ式ポンプに該当するのは_______です。 A. ギアポンプ B. ブレードポンプ C. ウォーターリングポンプ D. ヴォルテックスポンプ
この問題、ちょっと問題あるんじゃない？Aの選択肢が容積ポンプで、他はすべて羽根車式のようですね！
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