工芸基礎知識（選択問題）20180717
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排出圧力が過度に上昇するのを防ぐために、安全弁を設置しなければならないポンプはです。 A. 往復ポンプ B. 齒車ポンプ C. スクリューポンプ D.A+B+C
D~~~~~~~~~~
答えはDです
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