Automation System
The hardware device Jhat acts as both a switching and connecting unit is called a(n):

multiplexer
concentrator
communications processor
RS-232C port
None of these

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Automation System
Numerical control:

applies only to milling machines
is a method for controlling the operation of a machine by means of a set of instructions
None of these
All of these
is a method for producing an exact number of parts per hour

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