What is the function of wearing rings found on some centrifugal pumps? （）<br>A:Absorb erosion of high velocity discharge stream<br>B:Seal pump shaft against entry of air<br>C:Isolate the outlet side from the inlet side<br>D:Dampen the turbulent discharge flow

What is the function of wearing rings found on some centrifugal pumps? （）
A:Absorb erosion of high velocity discharge stream
B:Seal pump shaft against entry of air
C:Isolate the outlet side from the inlet side
D:Dampen the turbulent discharge flow

出自：海船船员证

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