Automation System
An aneroid barometer

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

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Automation System
Semiconductor devices:

have a very short infant mortality period
None of these
are less reliable than electro¬mechanical components
usually have a very short MTBF (mean time between failure)
All of these

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