Automation System
The use of specialized workstations:

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

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Automation System
Direct Numerical Control means:

complete elimination of a need for a human operator.
eliminating computers from the manufacturing process
using several computers to control one large machine
using one computer to control several machines
None of these

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