... multistage pump 多级泵; multistage pump with single impeller 单叶轮多级泵; non-clog(-ging)pump 不堵塞泵; ...
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... 多级泵送 multiple stage pumping 单叶轮多级泵 multistagepumwith single impeller 摇摆式多级筛 swing type of multi-stage sifter ...
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单叶轮多级泵联轴器 multistage pump coupling with single impeller
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