Automation System
A venturi tube:

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

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Automation System
The computer graphics system called SKETCHPAD was demonstrated at

Massachusetts Institute of Technology in 1963
Imperial college of Science and Technology, London, 1973
University of Aston, Birmingham, 1960
Cranfield Institute of Technology, London, 1962
None of these

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