短語詞組短語changeover r valve 旋轉閥plate type changeover valve 板式轉換閥Manual changeover valve 手動切換閥塊changeover valve detail 多向閥hydraulic changeover valve 液動換向閥electromagnetic changeover valve 電磁轉換閥emergency changeover valve 應急轉換閥auxiliary changeover valve 輔助切換閥;匡助切換閥;輔佐切換閥ball changeover valve 球形轉換閥 返回 changeover valve