Automation System
The use of specialized workstations:

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

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Automation System
Time proportioning control:

cannot use a TM990 micro¬computer
None of these
is less efficient than normal PID control
a and b above.
can be used on a PM550 programmable process controller

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