Automation System
A venturi tube:

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

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Automation System
Light sensors:

None of these
work in direct sunlight
come in a wide variety of mounting styles
cannot be used a s limit switches.
never use infrared light as light source

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Automation System
Trend analysis:

None of these
can improve control system response
is a brand new concept
is used only in financial planning
requires a very expensive system to implement

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