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【简答题】
什么是交越失真?产生交越失真后有用信号将受到哪些频率成分的影响?如何消除交越失真的影响?
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反馈参考答案：
举一反三
【简答题】ARP协议工作在OSI模型的哪一层()。
【单选题】--- ? --- The one on the desk.
A.
Where is your book
B.
Which book do you want
C.
What’s on the desk
D.
Whose book is on the desk
【单选题】In writing up the log book at the end of your watch，you make an error．which of the following is the way to correct the error？ ______.
A.
Carefully and neatly erase the entry and rewrite it correctly
B.
Remove this page of the log book and rewrite all entries on a clean page
C.
Blot out the error completely and rewrite the entry correctly
D.
Cross out the error with a single line and rewrite the entry correctly
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