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An oscilloscope is easily the most useful instrument available for testing circuits because it allows you to monitor signals at the input and output of each system block.
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.
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（ ）。
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