题目内容

单位脉冲函数δ(t)傅氏变换为（）

A. π[δ(ω+ω0)+ δ(ω-ω0)]
B. πj[δ(ω+ω0)+ δ(ω-ω0)]
C. 1
D. 1/(jω)+ πδ(ω)

查看答案

搜索结果不匹配？点我反馈

更多问题

若f(t)的Fourier变换为F(ω),则f(t+1)的Fourier变换为()

A. ejωF(ω)
B. e-jωF(ω)
C. F(ω+1)
D. F(ω-1)

查看答案

U7T2Match the following expressions with Chinese counterparts. Pls refers to Text 2 in Unit 7.

查看答案

Why should we consider climate change when making economic decision?

A. Because it tells us much about future risks.
Because it promotes scientific advancement
C. Becauseit has huge potential significance.
D. Because it helps us avoiding making wrong decisions.

查看答案

The author takes the example of polar ice to illustrate _______.

A. the consequences of greenhouse gas emission
B. the unknown effects of climate change
C. the harmful effects of global warming
D. the reasons why polar ice melts

查看答案

单位脉冲函数δ(t)傅氏变换为（ ）

A. π[δ(ω+ω0)+ δ(ω-ω0)] B. πj[δ(ω+ω0)+ δ(ω-ω0)] C. 1 D. 1/(jω)+ πδ(ω)

若f(t)的Fourier变换为F(ω),则f(t+1)的Fourier变换为()

U7T2Match the following expressions with Chinese counterparts. Pls refers to Text 2 in Unit 7.

Why should we consider climate change when making economic decision?

The author takes the example of polar ice to illustrate _______.

单位脉冲函数δ(t)傅氏变换为（）

A. π[δ(ω+ω0)+ δ(ω-ω0)]
B. πj[δ(ω+ω0)+ δ(ω-ω0)]
C. 1
D. 1/(jω)+ πδ(ω)