铬片, Chromium pieces

钴粉, Cobalt powder

钴箔, Cobalt foil

钴箔, Cobalt foil

钴丝, Cobalt wire

铜粉, Copper powder

铜薄片, Copper flake

铜柱, Copper slug

铜箔, Copper foil

铜箔, Copper foil