Automation System
Today, programmable controllers:

None of these
can be cost effective even when replacing just a few relays
are relatively low cost compared with the original digital equipment available for industrial control
All of these
are more powerful then the first controllers on the market

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Automation System
The main function(s) of computer in CAD is/are

To enhance the analytical and logical power of the designer
To relieve the designer from routine repetitious tasks.
To serve as an extension to the memory of the designer
All of these
None of these

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