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单项选择题
A.mixed-flow
B.axial-flow
C.centrifugal
D.displacement
单项选择题
A.(1)and(2)
B.(2)and(3)
C.(1)and(3)
D.(1),(2)and(3)
单项选择题
A.(1)and(2)
B.(1),(2)and(3)
C.(1)and(3)
D.(2)and(3)
单项选择题
A.providing the impeller with balancing holes
B.the use of symmetrical impeller
C.neither A nor B
D.either A or B
单项选择题
A.throttling the pressure line
B.changing the speed of the rotor
C.either A or B
D.None of the above is true
单项选择题
A.(1)only
B.(1)and(2)
C.(1),(2)and(3)
D.(2)and(3)
单项选择题
A.centrifugal
B.plunger
C.injector
D.water
单项选择题
A.discharges into a gradually widening channel
B.has stationary diffuser vanes
C.produces no kinetic energy
D.All of the above are true
单项选择题
A.Piston pump
B.Screw pump
C.Diffuser pump
D.Water-ring pump
单项选择题
A.pump entry branch
B.outlet pipe
C.impeller
D.None of the above is true