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【单选题】
下列中哪种扩频技术采用伪随机序列PN对发送的窄带信号进行调制,使其成为一个频谱扩展的扩频信号。( )A.
调频扩频
B.
直接序列扩频
C.
跳时扩频
D.
线性调频
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【单选题】听力原文：M: I come to walk with you, Fanny. Shall I? It is a long while since we have had a comfortable walk together. W: Really, Edmund? M: In order to have a comfortable walk, something more is necessar...
A.
two cousins
B.
brother and sister
C.
husband and wife
D.
father and daughter
【简答题】Attention to detail is something everyone can and should do — especially in a tight job market. Bob Crossley, a human-resources expert notices this in the job applications that come cross his desk ev...
【简答题】Dear Mr. Black， I’m very thank to you for inviting me to stay with you in the come summer vacation. I have been dreamed of seeing you again so that I can get help from you in my English learning. And ...
【简答题】集合{a,b,c}的所有非空真子集是 ____ _______________ 。
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