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【单选题】
激励器的作用有：——。①用来产生具有所需工作种类的信号；②产生所需发射频率的信号；③用来放大射频信号，以达到额定的输出功率；④产生单边带信号，再将它线性地搬移到发射频率范围内。
A.
A．①②④
B.
B．①③④
C.
c．①②③
D.
D．②③④
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