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單項選擇題

In （） pumps a closed discharge valve will cause bursting discharge pressure.

A.centrifugal
B.plunger
C.injector
D.water

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單項選擇題

The volute pump is one in which the impeller （）.

A.discharges into a gradually widening channel
B.has stationary diffuser vanes
C.produces no kinetic energy
D.All of the above are true

單項選擇題

Which of the following pumps belongs to centrifugal pump?（）

A.Piston pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump

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