单项选择题

With respect to centrifugal pump impellers, which of the following descriptions represents the correct centrifugal pump classification? （）

A.Single stage or multistage
B.High pressure or low pressure
C.Open or close coupled
D.Horizontal or vertical

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单项选择题

A.contaminated fluid
B.pitted thrust rings
C.worn pintle bearings
D.obstructed suctions passage

单项选择题

A.shaft and impeller
B.motor and pump shaft
C.casing and impeller wearing rings
D.lantern ring and impeller

单项选择题

A.central valve
B.radial plunger
C.floating ring
D.cylinder body