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.Cold finger-A protracted copper rod extending together The within from the electron column. When its reservoir is saved stuffed with liquid nitrogen, the rod attracts contaminants that might if not degrade the chamber's vacuum.+ Giá r?t