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【毎日一問】2017.10.30

2017-10-30View Original

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流体の流量を調整したり、粒子を含む物質を輸送したりするのに適していないバルブは_______です。 A. ノズルバルブ B. 止回弁 C. グラブバルブ 答え:C

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