题目内容

WhatdidStephen'smotherdowhenshecameintothekitchen?

A. Shegavehimalonglecture.
B. Sheshoutedathiminanger.
C. Sheenjoyedthewonderfulmess.
D. Shecleanedupthemesswithhim.

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WhatdidStephen'smotherteachhimlater?

A. Howtodoanexperiment.
B. Howtocarryamilkbottle.
C. Howtocleanupspilledmilk.
D. Howtoavoidmakingmistakes.

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WhatdidStephenlearnfromthisexpericence?

A. Mistakescanbecomelearningopportunities.
B. Mistakesarejustlikescientificexperiments.
C. Oneshouldsometimesmakemistakes.
D. Oneshouldtrytoavoidmakingmistakes.

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周期矩形脉冲信号频谱的谱线间隔只与脉冲的周期有关。

A. 对
B. 错

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从信号频谱的连续性和离散性来考虑，周期信号的频谱是。

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WhatdidStephen'smotherdowhenshecameintothekitchen?

A. Shegavehimalonglecture. B. Sheshoutedathiminanger. C. Sheenjoyedthewonderfulmess. D. Shecleanedupthemesswithhim.

WhatdidStephen'smotherteachhimlater?

WhatdidStephenlearnfromthisexpericence?

周期矩形脉冲信号频谱的谱线间隔只与脉冲的周期有关。

从信号频谱的连续性和离散性来考虑，周期信号的频谱是 。

A. Shegavehimalonglecture.
B. Sheshoutedathiminanger.
C. Sheenjoyedthewonderfulmess.
D. Shecleanedupthemesswithhim.

从信号频谱的连续性和离散性来考虑，周期信号的频谱是。