Automation System
The program execution time:

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

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Automation System
Stepping motors:

can run at varying speeds
can be built to index different amounts by changing the pole configuration
do not require commutators
can run both clockwise and counterclockwise
All of these

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