单选题Hydraulic machinery failures are commonly caused by misalignment of the system components and by （）.Ahydraulic fluid contaminationBexcessive fluid frictionCturbulent fluid flowDfluid pressure surges
单选题
Hydraulic machinery failures are commonly caused by misalignment of the system components and by （）.
A
hydraulic fluid contamination
B
excessive fluid friction
C
turbulent fluid flow
D
fluid pressure surges
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