Automation System
Three different aspects of colour are used to define specific colours. They are hue, saturation, and:

gray scale
metamer
shading
None of these
value

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

All of these
it is the best industrial control language ever developed.
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

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