【单选题】【消耗次数：1】
确定信号可分为_________两类，前者频谱具有的特点是_________，后者的频谱具有特点是_________。（）
①
简单周期和复杂周期信号，连续，离散
②
周期和瞬态信号，连续，离散
③
周期和非周期信号，离散，连续
④
周期和非周期信号，连续，离散
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