Automation System
Semiconductor devices:

usually have a very short MTBF (mean time between failure)
None of these
All of these
are less reliable than electro¬mechanical components
have a very short infant mortality period

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

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Automation System
A venturi tube:

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

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