题目内容
(请给出正确答案)
[主观题]
555定时器构成的单稳态触发器由暂稳态返回稳态,必须有外加接触信号作用。
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第5题
A、all human life is seen as an exile
B、all human life is seen as a bird
C、all human life is seen as a wanderer
D、all human life is seen as a pilgrimage
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