Variable-speedcontrol pump performance, more economical, a broader scope of application of all agricultural water pumps can be used.
变速调节水泵性能，比较经济，适用范围较广，对所有农用水泵均能采用。
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Variable-speedcontrol we already know, at a certain speed axial flow pump are working under, and to obtain the corresponding flow, lift, power and efficiency.