Automation System
Compared to humans, machines:

can make more complex decisions based on unexpected circumstances
None of these
(a) and (c)
make fewer errors
can work in harsher environments

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Automation System
Direct Numerical Control means:

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

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