Automation System
The program execution time:

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

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Automation System
Digital signals:

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

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