Chi ti?t D?ch v? in tem nhãn m? ph?m ?em l?i s? ?n t??ng cho th??ng Hello?u D?ch v? in tem nhãn m? ph?m ?em l?i s? ?n t??ng cho th??ng hi?uA differential pumping aperture is used to independent the gun chamber, pumped from the ion pump, from the rest of the column to be able to defend the electron gun from degrading.Ngay sau khi nh?n ???c ti?n c?