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Fill in the blanks with the words given below. Change the form where necessary. Each word can be used only once.derail recedebrinkparalyzepatheticmidstappraiseascend intervenedismayThose of us who were born with a shy temperament(性格) can carry the adolescent fears, which may never ______, into adulthood.

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Fill in the blanks with the words given below. Change the form where necessary. Each word can be used only once.derail recedebrinkparalyzepatheticmidstappraiseascend intervenedismayThe blizzard(暴风雪) moved south, turning into an icy rain that _______ the airports for three days.

实序列傅里叶变换的实部和虚部分别为()。

A. 奇函数和偶函数
B. 偶函数和奇函数
C. 奇函数和奇函数
D. 偶函数和偶函数

对于序列的傅里叶变换而言,其信号的特点是()。

A. 时域离散非周期
B. 时域连续非周期
C. 频域连续周期
D. 频域连续非周期

在时域对连续信号进行抽样,在频域中,所得频谱是原始信号的频谱的周期延拓。

A. 对
B. 错

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