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听力原文:M: What do you think of Professor Brown's lecture? W: The topic was interesting, but the lecture was much more difficult to follow than I had expected. Q: What does the woman say about the lecture? (3)
A.
It was a long lecture, but easy to understand.
B.
It was not as easy as she had thought.
C.
It was as difficult as she had expected,
D.
It was interesting and easy to follow.
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参考答案:
举一反三
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A.
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B.
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【单选题】设信道采用2DPSK调制,码元速率为300波特,则最大数据速率为 (15) b/s。 (15)
A.
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B.
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C.
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