单项选择题

傅立叶变换引入红外光谱，是利用数学换算，把干涉波的时间函数变换成以下哪种参数的函数，这样，在特定的频率下出现特征红外吸收。

A．时间
B．频率
C．波长
D．吸光度

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When the short run effect of an increase in aggregate demand results in a rise in the nominal exchange rate

A．exchange rate overshooting has occurred.
B．the policy assignment problem is the likely culprit.
C．the long run equilibrium has likely increased as well.
D．monetary and fiscal authorities must renegotiate their roles in the economy.

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图示结构用矩阵位移法计算时未知量数目为 _　__ 个。