单选题Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and （）.Afluid frictionBfluid turbulenceCcomponent misalignmentDpressure surges
单选题
Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and （）.
A
fluid friction
B
fluid turbulence
C
component misalignment
D
pressure surges
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