Automation System
The two types of relays in a PC are:

an output relay and a control relay
a control relay and a retentive relay
None of these
a retentive relay and a non-retentive relay
All of these

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Automation System
Vision sensors:

will remain very costly
can not improve much in the next decade
None of these
All of these
will more closely match the capabilities of the human eye

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