工芸基礎知識（選択問題）20180715
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原理的に、逆転時に逆方向に吸排できるポンプとは。 A.遠心ポンプ B.密閉渦巻きポンプ C.ウォーターリングポンプ D.B+C
B. 閉じた渦巻きポンプ C. 水環ポンプ
D~~~~~~~~~~~
私の答えはB、密閉型渦巻きポンプです
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