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Let W be Warsaw circle and f : W → W be continuous.
设W是Warsaw圈, f:W →W是连续映射.
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W, W series marine self - priming pumps are applicable to pumping clear water and light eroding medium.
型直联式船用自吸旋涡泵适用于船舶装置抽送清水以及弱腐蚀性的液体介质.
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