题目内容
Function generators and oscilloscopes are useful tools in the electronics field. They allow the user to create and measure electrical waveforms when testing electronic devices and circuits.
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An oscilloscope shows you how voltage varies with time. It plots a voltage against time graph on the screen. The y-axis is voltage and the x-axis is time. This is most useful when you look at varying voltages.
判断三极管工作在饱和区的条件是（ ）。
二极管门电路存在电平偏移现象,即输出的高、低电平和输入的高、低电平不相等。
可以将多个二极管门电路串联使用。
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