题目内容

非周期信号通过求取频谱，非周期信号的频谱是谱。

A. 傅里叶变换，连续谱
B. 傅里叶变换，离散谱
C. 傅里叶级数，连续谱
D. 傅里叶级数换，离散谱

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周期信号通过求取频谱，周期信号的频谱是谱。

A. 傅里叶级数，连续谱
B. 傅里叶级数，离散谱
C. 傅里叶变换，连续谱
D. 傅里叶变换，离散谱

游标卡尺零位未对齐所引入的测量误差属于（）

A. 系统误差
B. 随机误差
C. 粗大误差

Which of the following is NOT the characteristic of a concept ?

A. General.
B. Concrete.
C. Abstract.
D. Intangible

Which of the following is NOT the content of introduction in writing a cause and effect essay ?

A. Opening statement.
B. Explaining the issue.
C. Presenting your thesis.
D. Giving an example.