Automation System
Timing using a TM990 micro-computer:

both (b) and (c)
is available on the standard CPU board
None of these
require an external timer added by the user
can be handled in software

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Automation System
A venturi tube:

can be used to measure gas or liquid flow rates
is made only of metal
measures the presence of a liquid
is extremely difficult to use
None of these

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