Chi ti?t D?ch v? in tem nhãn m? ph?m ?em l?i s? ?n t??ng cho th??ng hi?u D?ch v? in tem nhãn m? ph?m ?em l?i s? ?n t??ng cho th??ng hi?uThe picture might be manipulated by altering the voltage with the gun to speed up or minimize the velocity of electrons and also altering the electromagnetic wavelength by way of the solenoids.D?a vào m?c ?ích,