Automation System
An aneroid barometer

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

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Automation System
Direct Numerical Control means:

using one computer to control several machines
eliminating computers from the manufacturing process
complete elimination of a need for a human operator.
None of these
using several computers to control one large machine

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