Chi ti?t D?ch v? in tem nhãn m? ph?m ?em l?i s? ?n t??ng cho th??ng Hello?u D?ch v? in tem nhãn m? ph?m ?em l?i s? ?n t??ng cho th??ng Hello?uAt the top on the column is definitely the electron gun which couples into a substantial voltage supply accustomed to set the kinetic Power of your electron beam. Standard accelerating voltages vary from