净化过程主要是加入锌粉到溶液，这样所有电位序在锌之后的元素都被置换出来并且凝固沉淀下来。
Purification is mainly done by adding zinc dust to the solution. As all the elements to be removed lie below zinc in the electrochemical series they can be precipitated by cementation.
本文用相干态方法导出了相干态直积空间中的一类置换算符，给出了它们的正规序形式和显式形式，并讨论了置换算符的一些性质。
A kind of permutation operators in the direct product space of coherent-states isderived in terms of the coherent-state method.
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