题目内容
由扭转试验可知，低碳钢试样扭转破坏的断面与试样轴线成45°的倾角，而扭转断裂破坏的原因，是由于断裂面上的剪应力过大而引起的。
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An oscilloscope is easily the most useful instrument available for testing circuits because it allows you to see the signals at different points in the circuit.
The best way of investigating an electronic system is to monitor signals at the input and output of each system block, to check that each block is operating as expected and is correctly linked to the next .
An oscilloscope to display a voltage – time ( V/t ) graph , a graph of voltage against time. Voltage on the vertical or Y-axis, and time on the horizontal or X-axis.
Turn the POWER on. Apply a signal to the input terminal. Set the INTENSITY and FOCUS controls correctly, the spot will be reasonably bright, and as sharply focused as possible .
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