Automation System
The coordinate system used to describe a workpiece:

None of these
changes from part to part
All of these
is always two-dimensional
is defined with respect to a point on the machine

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Automation System
Numerical control:

All of these
is a method for producing an exact number of parts per hour
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

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