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调幅广播
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【广播节目传输覆盖】
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amplitude modulation radio
调幅广播
以幅度调制方式对音频信号进行无线电传输的模拟声音广播形式。幅度调制是将要传送的信号作为调制信号控制载波的振幅,使其按照调制信号的规律变化。
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full invariant subgroup
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Full-length History of Modern Chinese Literature
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