Automation System
The difference between CAD and CAM is that CAD software is directed at product design while CAM software is:

specifically for PC-board design
concerned with production and control of tool design
concerned with management programs
designed for communications
None of these

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Automation System
Numerical control:

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

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