Automation System
The concept of a general CAD system was that it should provide:

A set of basic system functions and utilities.
All of these
A system for handling user actions.
None of these
A system for the operation of applications programming.

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

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

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