题目内容
边沿触发器只在时钟脉冲CP上升沿或下降沿时刻接收输入信号，电路状态才发生翻转，从而提高了可靠性。
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主从触发器和边沿触发器的缺点是存在空翻现象。
She still remermbers the days _____ she spent in the countryside.
Helen was much kinder to her youngest child than she was to the others, _____, of course, made the others unhappy.
When people talk about the cities of U.S., the first _____ comes into mind is New York.
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