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

None of these
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.
The beam constantly travels across the screen to turn on/off a series of pixels.

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Automation System
A solenoid:

is widely used in industrial automation
is spring operated
is related to an aneroid
None of these
can be used only in de circuits

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