铬粉末, Chromium powder

铬片, Chromium pieces

铬片, Chromium pieces

钴粉, Cobalt powder

钴片 , Cobalt pieces

钴箔, Cobalt foil

钴箔, Cobalt foil

钴溅射靶, Cobalt sputtering target

钴线, Cobalt wire

纳米铜, Copper nanopowder