This pump is two-stage structure: with the pump cover with centrifugal work between clapboard wheel - the first level;

该泵为两级结构：泵盖与外隔板间装有离心工作轮——第一级；

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This pump is two-stage structure: with the pump cover with centrifugal work between clapboard wheel - the first level;

该泵为两级结构：泵盖与外隔板间装有离心工作轮——第一级；

youdao