Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and （）.<br>A:fluid friction<br>B:fluid turbulence<br>C:component misalignment<br>D:pressure surges

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

出自：海船船员证

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