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 stage
查看答案