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 program execution time:

None of these
All of these
must be slower than the fastest mechanical operation that is to be controlled
will vary depending on the language used
cannot be changed once the program is written

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