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某单吸单级离心泵，Q=0.0735 m3／s，H=14.65 m，用电机由皮带拖动，测得n=1 420 rpm，N=3．3 kW；后因改

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某单吸单级离心泵，Q=0.0735 m3／s，H=14.65 m，用电机由皮带拖动，测得n=1 420 rpm，N=3．3 kW；后因改

为电机直接联动，n增大为l 450 rpm，此时泵的工作参数为()。

A.Q=0．075 0 m3／s，H=15．28 m，N=3．50 kW

B.Q=0．076 6 m3／s，H=14．96 m，N=3.50 kW

C.Q=0．075 0 m3／s，H=14．96 m，N=3．37 kW

D.Q=0．076 6 m3／s，H=15．28 m，N=3．44 kW

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