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【单选题】
为使采样输出信号不失真地代表输入模拟信号，采样频率fs和输入模拟信号的最高频率fim的关系是fs（）fim。A.
≥
B.
≤2
C.
≤
D.
≥2
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【单选题】Why did the early Pilgrims want to share their feast with the Indians?
A.
To show friendship.
B.
To ask for their help in the coming winter.
C.
So they could eat some Indian bread puddings.
D.
To try to teach them to grow crops.
【简答题】用中国知网查找我校2018-2019年发表在学术期刊上的有关食品安全方面的文献,并简述查找过程。
【单选题】Why did American Indians begin to see the white settlers as a danger to them?
A.
They fought against any law protecting the right of Indians.
B.
The settlers killed the animals and brought new diseases.
C.
They took away their animals and sold them to other white people.
D.
They made American Indians work hard without pay.
【简答题】Why did the Indians think Buck was a ghost?
【简答题】Why did Columbus call the people he saw in the Bahamas “Indians”?
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