Automation System
A venturi tube:

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

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Automation System
Today, programmable controllers:

are more powerful then the first controllers on the market
can be cost effective even when replacing just a few relays
All of these
are relatively low cost compared with the original digital equipment available for industrial control
None of these

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