Automation System
Digital signals:

have a sinusoidal shape.
None of these
are assigned values of 1 or 0 depending on the voltage level
can have three possible levels
have a frequency measured in units of hertz

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Automation System
The computer graphics system called SKETCHPAD was demonstrated at

Cranfield Institute of Technology, London, 1962
University of Aston, Birmingham, 1960
None of these
Imperial college of Science and Technology, London, 1973
Massachusetts Institute of Technology in 1963

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