Automation System
The coordinate system used to describe a workpiece:

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

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Automation System
Relay ladder logic is used in a PC because:

None of these
it is impossible to write a control program for a machine in any other logic
All of these
it is the best industrial control language ever developed.
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use

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