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4採用多段式離心葉片設計,效率佳,揚程高 Using multiple acentric plate design, good efficiency, and high lift. 4葉輪採專利背對背方式,可抵銷葉輪作用力,軸承使用壽命更長 Impeller using patent back-to-back way, being able to counteract impeller action, and longer life-span of the axis. 4結構堅固,耐用性佳 Solid structure, and good reusability
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