狠狠色丁香婷婷综合潮喷_国产AV无码专区亚洲AV极速版_国产精品麻花传媒二三区别_成人免费一区二区三区视频

ZJ/ZJB系列羅茨(ci)(ci)真空(kong)泵(beng)(beng)(beng)（簡稱 羅茨(ci)(ci)泵(beng)(beng)(beng)）是指泵(beng)(beng)(beng)內裝有(you)(you)兩個相反方向同步旋轉的葉形轉子(zi)，轉子(zi)間、轉子(zi)與泵(beng)(beng)(beng)殼內壁間有(you)(you)細小間隙而互(hu)不接觸的一種旋轉式變容(rong)真空(kong)泵(beng)(beng)(beng)（須(xu)與前級(ji)泵(beng)(beng)(beng)組(zu)臺方可(ke)使用），是目前獲得中(zhong)、高真空(kong)主(zhu)要抽氣(qi)設備之一．

ZJ/ZJB series Roots vacuum pump (referred to as: Roots pump) refers to a kind of rotation in which the two rotors are rotated synchronously in opposite directions, and there is a small gap between the roto and the inner wall of the pump casing without contact with each other. The variable displacement vacuum pump is one of the main pumping equipments for medium and high vacuum.