【コントロール版】毎日一問 20180523
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制御バルブの負の作用により、制御バルブがエアオン式の場合、Kvは（）を満たす。 A、ゼロに等しい B、ゼロより大きい C、ゼロより小さい D、判断できない 答え：C
C、ゼロ未満
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