An increase in interest rates

A. increases the cost of holding money and increases the quantity demanded.
B. increases the cost of holding money and decreases the quantity demanded.
C. decreases the cost of holding money and increases the quantity demanded.
D. decreases the cost of holding money and decreases the quantity demanded.

A policy to reduce inflation is likely to increase unemployment in

A. the short run and the long run
B. the short run but not the long run
C. the long run but not the short run
D. neither the short nort long run

Budget deficits reduce national saving causing real interest rates

A. and investment to fall
B. and investrment to rise
C. to rise and investment to fall
D. None of the above

Tax changes that reduce taxes on interest and capital income may lower tax revenues which

A. increases public saving and so increases national saving
B. increases public saving and so decreases national saving
C. decreases public saving and so increases national saving
D. decreases public saving and so decreases national saving

Facing an adverse supply shock, policymakers can increase aggregate

A. supply, which increase prices and output
B. supply, which decrease prices and increase output
C. demand, which increases prices and output
D. demand, which decreases prices and increase output

When the money supply increases, interest rates

A. rise and aggregate demand shifts right.
B. fall and aggregate demand shifts left.
C. rise and aggregate demand shifts left.
D. None of the above is correct.

改变一个信号中各频率分量的相对大小和相位，或者全部消除某些频率分量的过程，称为。

按其功能应用不同，滤波器一般可分为两类，用于改变频谱形状的滤波器称为滤波器，用于通过某些频带范围内的信号而消除掉其它频带范围内信号的滤波器称为滤波器。

简述常用的频率选择性滤波器有哪些？各有什么特点？

bookstore的汉语意思是？

A. 咖啡店
B. 书店