Automation System
A venturi tube:

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

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Automation System
Straight-line operations:

All of these
None of these
must be parallel to one of the axes of the coordinate system
can include diagonal cuts if they aren't curved
must be limited to two per workpiece

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Automation System
There are several procedures you can implement to provide maximum security. The most important of these is:

do not allow unbonded service people to work on your equipment
do not leave training manuals unsecured
Verify the reputation of the people installing your system
None of these
run regular simulated tests using TARP (testing of Applications Recovery Planes)

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