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【判断题】
两连续周期信号之和一定是周期信号,而两周期序列之和不一定是周期序列。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】Several years ago, a television reporter was interviewing three of the most important people from local businesses. One was a very rich banker, another owned one of the largest companies in the world,...
【简答题】You can’t run in the hallways. (改为祈使句) ________ _________ in the hallways!
【单选题】Lucky became the most distinguished cat, because ______.
A.
she had eaten all the rats in London post office
B.
she had eaten most of the rats in London post office
C.
she had saved the life of a child
D.
she had prevented a conspired robbery
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