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A certain water delivery pipeline uses an IS50-32-200 centrifugal pump to send the water in the low-level open trough to the open trough which is 3 m higher than the low-level open trough. After the valve is fully opened, the flow is only about 3m3 / h. Now it is planned to use an additional pump of the same model to greatly increase the water delivery volume. Which of the following pump combinations is more reasonable ( )A.
Series connection
B.
Parallel connection
C.
A and B
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