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单选题
A multistage centrifugal pump can be BEST described as having ().
A
two or more impellers housed together in one casing and mounted on a single shaft
B
a single stepped impeller mounted in a progressively staged casing
C
a large radial clearance between the impeller and casing to prevent overheating due to
D
an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages
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更多 “单选题A multistage centrifugal pump can be BEST described as having ().A two or more impellers housed together in one casing and mounted on a single shaftB a single stepped impeller mounted in a progressively staged casingC a large radial clearance between the impeller and casing to prevent overheating due toD an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages” 相关考题
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set the relief valveB
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priming waterB
power supplyC
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Rough easing volute surfacesC
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They can be economically replaced as they wear outC
They can be removed when it is necessary to lighten the weight of the pumpD
They increase the strength of the shaft
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