Thanh toán linh ho?t: Thanh toán ti?n m?t tr?c ti?p khi nh?n tem ho?c thanh toán tr??c qua tài kho?n.At the very best in the column may be the electron gun which couples into a superior voltage supply used to established the kinetic Strength from the electron beam. Usual accelerating voltages vary from 80 kV as many as three hundred kV. The