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【简答题】
香农定律关于信道噪声的主要结论是: 对于有随机热噪声的信道,如果信道带宽为B(Hz),信噪比为S/N,则最大数据传输速率为B*log2(1+S/N ) b/s。电话系统的典型参数是信道带宽为3000Hz,信噪比为30dB,那么不管使用多少信号电平级,也不管采用多大的采样频率,决不能以大于多少的速率传输数据?
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反馈参考答案：
举一反三
【单选题】We don't know if the story is true, but we'll try our best to it
A.
verify
B.
justify
C.
amplify
D.
rectify
【单选题】听力原文： We don't know when man first began to use salt, but we do know that it has been used in many different ways throughout history. Historical evidence shows, for example, that people who lived over...
A.
To keep fish alive.
B.
To punish criminals.
C.
To preserve dead bodies.
D.
To help heal wounds.
【单选题】We don't know if the story is tree, but we'll try our best to ______ it.
A.
verify
B.
justify
C.
amplify
D.
rectify
【单选题】——Shall we go to Shanghai by plane? ——_____.
A.
It's your opinion
B.
I don' t mind
C.
It's all up to you
D.
That's your decision
【简答题】目前对心理障碍专业的医学诊断采用以下三类依据,即 CCMD: ;DSM: ;I CD 。
【单选题】We don't know if it ___. If it___,we won't go fishing.
A.
rains,will rain
B.
will rain, rains
C.
rains,rains
D.
will rain,will rain
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