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["浄化基礎知識", "流量流量調整なしで切断が必要な場所では、管路の抵抗を減らすために一般的に選択されるのは:( ) A. 切断阀 B.针型阀 C. 闸阀 D. 单向阀" ]"]

2018-11-07View Original

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要切断而不需要流量调节的地方,为减小管道阻力,一般选用:( ) A.截止阀 B.针型阀 C.闸阀 D.止回阀

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