BECKER贝克单级油润滑式真空泵：U3.6、U4.20、U4.40、U4.70SA/K、U4.70F/K、U4.100SA/K、U4.100F/K、U4.165SA/K、U4.165F/K、U4.190SA/K、U4.190F/K、U4.250SA/K、U4.250F/K、U4.400SA/K、U4.400F/K、U4.630SA/K、U4.630F/K
