铬立方体块, Chromium cubes

钴粉, Cobalt powder

钴柱, Cobalt slug

钴箔, Cobalt foil

钴箔, Cobalt foil

钴丝, Cobalt wire

钴丝, Cobalt wire

铜粉, Copper powder

铜粉, Copper powder

铜薄片, Copper flake