【单选题】【消耗次数：1】
带通调制中，容易实现，抗干扰能力强，使用较为广泛的技术是（）
①
调幅
②
调频
③
绝对调相
④
相对调相
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【简答题】
基本的带通调制方法有调幅、[填空]、调相
【简答题】
基本的带通调制方法有调幅、调频、[填空]
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