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【单选题】
要无失真传输某信号，信道传递函数需满足的条件是( )。
A.
幅频响应和响应均为常数
B.
幅频响应和响应的乘积为常数
C.
幅频响应或响应的导数为常数
D.
幅频响应和响应的导数都为常数
拍照语音搜题，微信中搜索"皮皮学"使用
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He could get it back next morning.
B.
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C.
He could get it back next afternoon.
D.
He could get it back next week.
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A.
Because his home is near the school.
B.
Because his bike is broken.
C.
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D.
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正确
B.
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【简答题】根据首字母提示和句意拼写单词。 1. Tom isn't in. May I take a m _____ for him? 2. F _____ of all, I'll have to finish my homework. 3. Everyone is s _____ to know the rules in our school. 4. I had a very unusual e ___...
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【单选题】听力原文：W: Are you going to study after supper, Tom, or would you like to come to the cinema with us? M: Thanks, but I have an exam tomorrow. Anyway, I've seen the movies they're showing there. Q: What i...
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查看完整题目与答案
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Because his home is near the school.
B.
Because his bike is broken.
C.
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D.
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查看完整题目与答案
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查看完整题目与答案
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B.
错误
查看完整题目与答案
【判断题】当一国出现收支逆差时,政府可以采取紧缩性财政政策,减少财政支出、提高税率。
A.
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B.
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查看完整题目与答案