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【简答题】
OFDM是多载波调制中的一种,它的各个子载波之间 ,且各个子载波的频谱有 的重叠。
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举一反三
【简答题】听下面一段材料，回答第1至3题。 1. Why did Jane call Mike? A. To ask him to meet her. B. To tell him about Tom. C. To borrow his car. 2. Where will Jane be in about one hour? A. At Mike's place. B. At the airport. C...
【单选题】They have decided to show the children around the small town because the brightly colored houses there appeal _____ children .
A.
to
B.
for
C.
against
D.
with
【简答题】In the small town where serious bombing took place in the last century people have reconstructed and extended bu______ to a magnificent view.
【简答题】光学平直仪是由平行光管和（）组成仪器本体，并配置一个在定长板上的（）组合而成。
【简答题】听下面一段材料，回答第1至3题。 1. Why did Jane call Mike? A. To ask him to meet her. B. To tell him about Tom. C. To burrow his car. 2. Where will Jane be in about one hour? A. At Mike's place. B. At the airport. C...
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