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【多选题】
单稳态触发器是脉冲整形电路，下面对单稳态触发器的描述真确的是（）。
A.
单稳态触发器有一个稳态和一个暂稳态
B.
没有外加信号触发时，电路处于稳态
C.
没有外加信号触发时，电路处于暂稳态
D.
有触发信号时，电路进入暂稳态，经过一段时间后电路自动返回稳态。
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