尽管锌和镍的价格有所下滑。
与铜、铝、锌和镍等贱金属一样，特种金属也受到工业活动的推动。
Like the base metals of copper, aluminium, zinc and nickel, speciality metals are driven by industrial activity.
用EDTA容量法测定锌和镍的总量，用差减法计算锌的质量浓度；
Total quantifies of zinc and nickel are determined with EDTA volumetry, from the total quantities minus the nickel concentration we obtain the zinc concentration.
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