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【多选题】
关于离散时间信号的变换域分析，说法错误的是A.
离散时间信号的变换域分析，是离散时间信号处理的一种 常用 手段。
B.
离散时间信号的变换域分析是离散时间信号分析的唯一手段。
C.
离散时间信号的变换域分析是离散时间信号分析的一种必要手段。
D.
离散时间信号的变换域分析是离散时间信号分析的一种可有可无的手段。
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【单选题】We should call on people _______ some protective measures _____ protect their from_______
A.
to make, to , being infected
B.
to make , in order to , infection
C.
to take , in order that ,being infected
D.
to take , so as to , being infected
【简答题】We call people from Egypt ______________.
【简答题】My family is not very large. There are only three cats. I’m a white cat. People call me Snow-white. My husband is a black cat. People call him Captain Black Cat. ( 黑猫警长 ) We have a beautiful daughter....
【单选题】听力原文： The native Americans, the people we call the 'Indians' had been in America for many thousands of years before Columbus arrived in 1492. The Indians were kind to the early settlers. They taught t...
A.
Friendly.
B.
Estranged.
C.
Hostile.
D.
Indifferent.
【简答题】Over thirty thousand years ago，people from northern Asia （亚洲北部） went to America．Today， we call these people Indians（印第安人）． The Indians went to America because the weather began to change．Northern Asia...
【简答题】This is a story from a meeting held by some people and two things in nature. We call it the Four-Sided Talk. Let’s “listen to” everyone carefully and find out what they think. People: We have lived on...
【单选题】The native Americana, the people we call the ' Indians', had been in America for many thousands of years before Christopher Columbus arrived 【61】 1492. The Indians were kind to the early 【62】 They tau...
A.
at
B.
in
C.
for
D.
since
【简答题】大气物理特性主要是指大气()和()随高度的变化规律。
【简答题】阅读理解 Over thirty thousand years ago people from northern Asia went to America. Today, we call these people Indians(印第安人). The Indians went to America because the weather began to change. Northern Asia...
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