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tg storytime,This category includes many kinds of pumps,such as molecular pump,diaphragm vacuum pump.

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    Molecular Pump adopts with grease lubricated precision ceramic bearings ,no oil vapor contamination ,with stable performance.,xxx sexvid

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    Diaphragm Vacuum Pump is used for vacuum filtration , reduced pressure distillation , rotary evaporation , vacuum concentration , centrifugal concentration , solid phase extraction etc .,bfvideos hd