Automation System
Semiconductor devices:

have a very short infant mortality period
usually have a very short MTBF (mean time between failure)
None of these
are less reliable than electro¬mechanical components
All of these

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Automation System
The refresh-vector CRT uses which of the following techniques?

The beam constantly travels across the screen to turn on/off a series of pixels.
Creates images on the screen by scanning straight-line vectors between selected points.
Uses an electron gun to continuously flood the surface of the tube.
None of these
Makes changes on the image by increasing the anode voltage.

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