Ch?n ch?t li?u tem nhãn: Ch?t li?u tem nhãn c?n ???c l?a ch?n phù h?p v?i lo?i s?n ph?m và m?c ?ích s? d?ng.The image may be manipulated by changing the voltage with the gun to accelerate or minimize the speed of electrons in addition to altering the electromagnetic wavelength by means of the solenoids.A vacuum program is made use of to main