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【单选题】
已知序列 x(n)=δ(n) ,其 N 点的 DFT 记为 X(k) ,则 X(0)= ( )A.
N-1
B.
1
C.
0
D.
N
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皮皮学刷刷变学霸
举一反三
【判断题】In western countries, people don't always say thank you to other people.( )
A.
正确
B.
错误
【简答题】A．There are too many students in the discussion. B．Some people don't let other people talk. C．Questions to discuss are too easy. D．She doesn't have time to prepare the discussion.
【简答题】A．Glasses for people who couldn't see anything. B．Glasses for people who couldn't read. C．Glasses for people who couldn't see well. D．Glasses for people who wore them to protect their eyes from sunshi...
【简答题】In Britain, people couldn't decide
【单选题】— Will there be more people in the future ? — No, ________. There will be fewer people.
A.
there is
B.
there isn’t
C.
there will
D.
there won’t
【简答题】On________ （平均），people who don’t smoke are healthier than people who do.
【单选题】使用洗耳球和吸量管时,1管尖插入溶液2将洗耳球中空气压出3松开左手手指4把洗耳球尖端垂直插入移液管口,正确顺序是( )
A.
①②③④
B.
②④①③
C.
①②④③
D.
④①②③
【单选题】—Won’t people work in the future? —__________. Robots will only do some of the work for people.
A.
Yes, they will
B.
Yes, they won’t
C.
No, they will
D.
No, they won’t
【单选题】以下关系表达式中,其值为True的是 。
A.
“XYZ”>”XYz”
B.
“VisualBasic”<>”visualbasic”
C.
“the”=”there”
D.
“8”
【单选题】It is true in American society that ______.
A.
many people don't take naps
B.
people don't like taking naps even given the chance
C.
people are prohibited to take naps
D.
American people need little sleep
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