Automation System
An aneroid barometer

measures pressure by sensing deflection of an evacuated chambers.
can measure only atmospheric pressure
is very unreliable
can be used to measure gas or liquid flow rates
None of these

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Automation System
Numerical control:

is a method for producing an exact number of parts per hour
All of these
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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