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

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

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Automation System
The use of specialized workstations:

None of these
reduces the host computer workload
provides limited growth potentials for 3-D
reduces the host computer workload and allows more users
has a high cost-performance tradeoff

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