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Thermionic guns consist of a filament, possibly manufactured from a sharply bent tungsten wire or maybe a ceramic crystal (e.g., LaB6 or CeB6) crystal fabricated with a sharp level at the end. Present-day is passed from the filament to heat the idea and emit electrons.Tem nhãn thực phẩm thường được in bằng decal giấy cán lớp màn