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【毎日一問】工程基礎知識(選択問題)20200319

2020-03-19View Original

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往復ポンプの良好な状態基準によれば、アスベスト系パッキンを使用した場合の重質油の漏れ量は(D)滴/分を超えてはならない。 A.10 B.15 C.20 D.30

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