Automation System
Computer-based controllers:

should be built in a modular fashion wherever possible
are very difficult to change
None of these
are very flexible
(a) and (c) above

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Automation System
Numerical control:

All of these
is a method for producing an exact number of parts per hour
is a method for controlling the operation of a machine by means of a set of instructions
None of these
applies only to milling machines

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