Attempts are made to eliminate axial thrust in centrifugal pump by （）.<br>A:providing the impeller with balancing holes<br>B:the use of symmetrical impeller<br>C:neither A nor B<br>D:either A or B

Attempts are made to eliminate axial thrust in centrifugal pump by （）.
A:providing the impeller with balancing holes
B:the use of symmetrical impeller
C:neither A nor B
D:either A or B

出自：海船船员证

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