该型泵叶轮采用偶数设计方案，全部叶轮轴向成对称分布，背对背安装；
The impeller of the pump is designed to even number, and all impeller shafts are symmetrically distributed and installed back to back.
该型泵叶轮采用偶数设计方案，全部叶轮轴向成对称分布，背对背安装；
The impeller of the pump is designed to even number, and all impeller shafts are symmetrically distributed and installed back to back.
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