煤制气高级

离心泵的调节阀开大时（）。

发布于 2021-02-17 09:01:42

【单选题】
A 吸入管路阻力损失不变
B 泵出口的压力减小
C 泵入口的真空度减小
D 泵工作点的扬程升高

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隔壁老樊 2023-02-17

一份耕耘，一份收获，付出就有回报永不遭遇过失败，因我所碰到的都是暂时的挫折。

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