Automation System
Digital signals:

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

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Automation System
The robot:

will be more useful when robot vision is improved significantly
is very primitive at the present
All of these
represents the most powerful new industrial automation tool currently on the horizon
None of these

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