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【单选题】
表示样本的测量数据集中地趋向某一个值,该值称为( )。A.
方差
B.
标准差
C.
均值
D.
误差
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【简答题】除了一些基本操作外 ,我对电脑一窍不通。(apart) ___________________________________,I know nothing about computer.
【单选题】听力原文：M: Nancy, why were you late today? W: I overslept and missed the bus. Why was Nancy late?
A.
She got up later than usual.
B.
The bus was late.
C.
She forgot she had classes.
【单选题】— Could you tell me _____? — I’m sorry. The traffic was too heavy.
A.
why were you late for the meeting
B.
why you were late for the meeting
C.
when you were late for the meeting
【判断题】At a cost of US$3.6 billion, the Mombasa-Nairobi SGR is Kenya's most expensive infrastructure project.
A.
正确
B.
错误
【多选题】关于傅里叶分析和小波分析的说法是（）。
A.
傅里叶分析进行的是频谱分析，而小波分析提供了一种自适应的时域和频域同时局部化的分析方法
B.
小波分析对局部时 — 频分析中具有很强的灵活性，被喻为时 - 频分析的显微镜
C.
傅里叶分析对非平稳信号的处理效果不好
D.
傅里叶分析能刻画信号时域的局部特征
【单选题】听力原文：M: Dilys, why were you late today? W:I overslept and missed the bus. Why was Dilys late?
A.
She got up later than usual.
B.
The bus was late.
C.
She forgot she had classes.
【多选题】关于傅里叶分析和小波分析的说法是( )。
A.
傅里叶分析对非平稳信号的处理效果不好
B.
小波分析对局部时-频分析中具有很强的灵活性,被喻为时-频分析的显微镜
C.
傅里叶分析进行的是频谱分析,而小波分析提供了一种自适应的时域和频域同时局部化的分析方法
D.
傅里叶分析能刻画信号时域的局部特征
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