工芸基礎知識（選択問題）20180403
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水環ポンプは主に使われます。 A. 圧送ガス B. 真空引き C. 液体の排出 D. A+B+Cヒント：ウォーターリングポンプは圧縮機としても液体の排出としても効率が低すぎる。
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