单项选择题
The amount of fluid delivered by a gear pump can be regulated by （）.
A.throttling the pressure line
B.changing the speed of the rotor
C.either A or B
D.None of the above is true
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相关考题
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单项选择题
Which of the following pumps are self-priming, and can deal with liquid from a level below the pump（） (1) ejector (2) screw (3) centrifugal
A.(1)only
B.(1)and(2)
C.(1),(2)and(3)
D.(2)and(3) -
单项选择题
In （） pumps a closed discharge valve will cause bursting discharge pressure.
A.centrifugal
B.plunger
C.injector
D.water -
单项选择题
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
