Seabed manganese nodules contain a great deal of metallic elements such as manganese, iron, copper, cobalt and nickel, and they were thought as an important substitute resource for land ore.
海底锰结核中含有大量的锰、铁、铜、钴、镍等金属元素，被公认为是一种重要的陆地矿产替代资源。
If by lead and tin, manganese, nickel and iron, silicon composed of copper alloys.
如由铅、锡、锰、镍、铁、硅组成的铜合金。
If by lead and tin, manganese, nickel and iron, silicon composed of copper alloys.
如由铅、锡、锰、镍、铁、硅组成的铜合金。
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