Exchange rate is a key alternating quantity 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。
The operating conditions in a permanent magnet were analyzed to quantity the magnetic induction changes on the surface with an alternating magnetic field.
针对电机的实际工作环境，研究了不同工作状态的磁体在交变磁场作用下表面磁感应强度随时间的变化。
The operating conditions in a permanent magnet were analyzed to quantity the magnetic induction changes on the surface with an alternating magnetic field.
针对电机的实际工作环境，研究了不同工作状态的磁体在交变磁场作用下表面磁感应强度随时间的变化。
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