Automation System
An aneroid barometer

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

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Automation System
A semi-continuous operation means:

None of these
the operation is continuous each shift, but stops between shifts
each operation in a sequence is continuous, but subsequent operations in the sequence may be different.
a computer is a required part of the machine
coffee breaks are allowed for the operator

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