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【简答题】
当信道中无信号传输时，加性噪声是否存在？（）（填是或否）
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】阅读理解。 Everyone needs friends. Friends bring us happiness and hope in our lives. But the ability to make friends changes from person to person. To some people, friends is easy, and to others it’...
【单选题】We make different kinds of friends during our lives. The friends above are .
A.
the friends of the family
B.
the online friends
C.
the old friends
D.
the bad friends
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