单选题If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be （）.Acontaminated fluidBpitted thrust ringsCworn pintle bearingsDobstructed suctions passage
单选题
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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