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.Chilly finger-A lengthy copper rod extending along the inside in the electron column. When its reservoir is held stuffed with liquid nitrogen, the rod attracts contaminants that might if not degrade the chamber's vacuum.Poster ???c in tr