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如何分析和确定一个信号是周期信号还是非周期信号?数学上如何论证
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举一反三
【单选题】The phenomenon illustrated by the appointment of Gus Wenner _______ .
A.
stops people from dreaming the American dream
B.
encourages the government to carry out public policies
C.
reduces the level of people’s tolerance of economic inequality
D.
narrows the possibilities of people at the bottom moving upward
【简答题】探伤仪电路主要由（）、电源电路、发射电路、接收电路、扫描电路、报警电路和显示电路组成。
【单选题】Which of the following is TRUE according to the first paragraph?
A.
Mexico has stepped into an aging society.
B.
It is not necessary for Mexico to control its population.
C.
Mexico population is younger than that of developed countries.
D.
It is not necessary for Mexico to develop its infrastructure.
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