单选题Attempts are made to eliminate axial thrust in centrifugal pump by （）.Aproviding the impeller with balancing holesBthe use of symmetrical impellerCneither A nor BDeither A or B
单选题
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
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