M?u tem decal trong su?t in UV m?c tr?ng ép kim óng ánh tuy?t ??p - In ?n b?i In K? Thu?t S? because 2006Chilly finger-A lengthy copper rod extending along the inside in the electron column. When its reservoir is retained crammed with liquid nitrogen, the rod attracts contaminants That may if not degrade the chamber's vacuum.Vi?c in tr?c ti?p l�