离心泵装置最常见的调节是用闸阀来调节,也就是用水泵的出水闸阀的开启度进行调节。关小闸阀管道局部阻力 S 值加大, () ,出水量逐渐减小。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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