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【多选题】
幅度调制的本质下面描述错误的是:( )A.
改变信号的频率
B.
改变信号的相位
C.
改变信号频谱的位置
D.
改变信号频谱的结构
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反馈参考答案：
举一反三
【单选题】I would like a(n) ________ for this cell phone. It always turns itself off.
A.
receipt
B.
exchange
C.
return
D.
employee
E.
refund
F.
service
G.
policy
【简答题】I would like a(n) for this cell phone. It always turns itself off.
【单选题】I would like a(n)________for this cell phone . It always turns itself off.
A.
refund
B.
receipt
C.
items
【单选题】I would like to find a(n) company after I graduate.
A.
possible
B.
promising
C.
best
D.
better
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