Automation System
The program execution time:

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

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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
can run both clockwise and counterclockwise
All of these
do not require commutators

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