题目内容

Metaphor is ancomparison between two things that are unlike in nature, yet share a _feature.

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In reading, when you find that it doesn’t make sense by understanding a word or sentence in its meaning, you will have to draw from it.

Summarize the four effective reading strategies in complete English sentences.

描述周期信号的数学工具是( )。

A. 相关函数
B. 傳氏级数
C. 傅氏变换
D. 拉氏变换

傅氏級数中的各项系数是表示各谐波分量的( )

A. 相位
B. 周期
C. 振幅
D. 频率