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  1. - 维基百科,自由的百科全书

  2. (过渡金属元素)_百度百科

  3. Copper - Wikipedia

  4. Copper | Uses, Properties, & Facts | Britannica

  5. 銅 - 維基百科,自由的百科全書

  6. Copper - Element information, properties and uses | Periodic Table

  7. 銅 (Cu) - Periodic Table

  8. Copper Facts: Chemical and Physical Properties - ThoughtCo

  9. - Wikiwand

  10. -金属百科