back to back impeller pump
back to back impeller pump
背对背叶轮泵
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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；
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