Centrifugal pumps can be designed with a number of impellers （） to attain a high final delivery pressure.<br>A:in series<br>B:in parallel<br>C:either A or B<br>D:None of the above is tree

Centrifugal pumps can be designed with a number of impellers （） to attain a high final delivery pressure.
A:in series
B:in parallel
C:either A or B
D:None of the above is tree

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