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【单选题】
,电路的输出信号uo电压值为( )A.
0V
B.
15V
C.
-7.5V
D.
7.5V
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【简答题】普通调幅信号的（）与调制信号的（）
【单选题】In drawing up the plan, they went to the library to _____ many books. [ ]
A.
bring up
B.
referr to
C.
look for
D.
try on
【简答题】A．Packing up to go abroad. B．Brushing up on her English. C．Drawing up a plan for her English course. D．Applying for a visa to the United States.
【简答题】用低频信号去改变高频信号______的过程，称为调幅。普通调幅信号的特点是：已调信号的包络变化与______信号变化规律相同，内含______分量，______分量和______分量。
【简答题】You might just as well tell the manufacturer that male customers ________ not like the design of the furniture. A．must B．shall C．may D．need
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