短语词组短语rotary -vane E vacuum pump 旋翼式真空泵Rotary -vane pump or pump 旋片帮浦或回转帮浦single -vane rotary pump 单叶片扭转泵;单叶片旋转泵sliding -vane rotary vacuum pump 旋片真空泵2X -type rotary vane vacuum pump X型旋片式真空泵 返回 rotary-vane pump