单项选择题

If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be （）.

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

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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

单项选择题

A.moisturizing
B.dehumidification
C.dampening
D.humidification