题目内容
电压比较器能够将模拟信号转换为数字信号（输出高电平或低电平）。
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集成运放工作在开环或引入正反馈，则工作在线性区。
1. If you are bored with doing the same thing every day, then you are stuck in a rut.
2. Many people think about changing their lives, but only a few of them take action.
3. Half of the holiday makers in the UK think about changing their jobs during the holidays.
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