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  1. PyDict

    ferroalloy

    • 鐵基合金
  2. 知識+

    • 為什麼南非會注重在於生產鑽石,黃金, 鐵合金

      South Africa is well known for its vast mineral resources possessing approximately 90% of the platinum metals on earth, 80% of the manganese, 73% of the chrome, 45% of the vanadium and 41% of the gold, as well as significant amount of diamonds...