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

None of these
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.
Makes changes on the image by increasing the anode voltage.

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Automation System
Stepping motors:

can run both clockwise and counterclockwise
can be built to index different amounts by changing the pole configuration
All of these
can run at varying speeds
do not require commutators

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