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【单选题】
周期信号被窗函数截断会导致信号的频谱发生（ ）。
A.
能量增加
B.
能量泄露
C.
能量突变
D.
能量不变
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【单选题】Listen to the conversation about eating out and choose the best answer to each of the following questions. Why don't they choose to go to the French restaurant?
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【单选题】Which of the following is NOT the secret of the couple's successful marriage?
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