Automation System
One advantage of a PC in industrial control is that it:

has a reliable long life compared to relay logic
is very difficult for the inexperienced programmer to understand
None of these
All of these
is unreliable because there are no moving parts

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Automation System
Sensors:

are not important in automation
probably will not improve over the next decade
are easily developed
None of these
will be much smarter and more sophisticated in the future

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