Decal gi?y ???c thi?t k? và in ?n v?i nhi?u ??c ?i?m, kích th??c khác nhau In decal cu?nAt the highest of your column is the electron gun which partners to the high voltage source used to set the kinetic energy of your electron beam. Typical accelerating voltages range from 80 kV up to three hundred kV. The microscope column contains a serie