Automation System
An operational amplifier:

All of these
can be used to subtract two or more signals
uses the principle of feedback
can be used to sum two or more signals
None of these

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Automation System
Numerical control:

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

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