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? due to the fact 2006Chilly finger-A lengthy copper rod extending alongside The within of your electron column. When its reservoir is held filled with liquid nitrogen, the rod attracts contaminants that might if not degrade the chamber's vacuum.A vacuum