【单选题】【消耗次数：1】
离心泵铭牌上标明的扬程m可理解为 。
①
A、该泵在规定转速下可以将20℃的水升扬的高度
②
B、该泵在规定转速、最高效率下将20℃的水升扬的高度
③
C、该泵在规定转速下对20℃的水提供的压头
④
D、该泵在规定转速、最高效率下对20℃的水提供的压头
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将一水池中20℃的水用泵输送到一敞口高位槽中，两液面之间的垂直距离为20m，泵的吸入口在水池液面上方2 m处。在某送液量下， 泵对水作功219.6J/kg，管内摩擦系数λ为0.018，吸入管路总长为40 m，压出管路总长为70m（两长度包括全部局部阻力的当量长度在内），输水管尺寸为Ф108 ×4mm，泵的效率为70%。已知20℃水的密度为1000kg/m3试求：（1）输水量，m3/h 。（2）泵的轴功率。
①
Q=43.52m^3/hN=9.45Kw
②
Q=53.72m^3/hN=3.79Kw
③
Q=43.52m^3/hN=3.79Kw
④
Q=53.72m^3/hN=9.45Kw
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在某单泵输液的管路中，并联一台同一型号的离心泵，单泵与并联双泵的输液效果为————。
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并联的输液量将是单泵的两倍
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