Exchange rate is a key alternatingquantity in a nation's economic system. The choice of Exchange rate system is a very critical and sensitive issues.
汇率是一国经济体系当中的一个关键变量，汇率制度的选择是一个十分关键和敏感的问题。
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The operating conditions in a permanent magnet were analyzed to quantity the magnetic induction changes on the surface with an alternating magnetic field.