单选题Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.AThey are less expensiveBThey are smaller for equivalent pumping abilityCThey pump more cargo in less timeDAll of the above
单选题
Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.
A
They are less expensive
B
They are smaller for equivalent pumping ability
C
They pump more cargo in less time
D
All of the above
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