[单选题]关于比转数的说法,正确的是哪一项?( )

A、轴流泵比转数最小
B、可用比转数的大小来划分泵与风机的类型
C、随着泵转速增加,比转数减小
D、随着泵比转速的增加,比转数增加

参考答案： B

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