Automation System
The APT (automatically progra-mmed tools) language is used with:

None of these
drafting systems
programmable controllers
large automation systems
numerical controlled machines.

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

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

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