– B??c five: Cho máy in s?n xu?t tem nhãn v?i s? l??ng l?n theo m?u ?ã duy?t c?a khách hàngA differential pumping aperture is accustomed to independent the gun chamber, pumped with the ion pump, from the remainder of the column so that you can secure the electron gun from degrading.The thermionic emitter is coupled to an electrode in the sha