工芸基礎知識（選択問題）20180526
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工芸基礎知識（選択問題）20180526 喉口面積比mが小さい水噴射ポンプ。 A. 高揚程噴射ポンプ B. 低揚程噴射ポンプ C. mは揚程と無関係 D. 効率が高い
A.は高揚程ジェットポンプです
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