Automation System
Historically, central systems were used because:

All of these
memory consumed a large amount of power
memory was very expensive
semiconductor memory was not available
None of these

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Automation System
An operating system:

provides ability for other programmers to understand the software structure
None of these
is useless in most control applications
can help reduce software development time
All of these

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Automation System
CAE and CAM are linked through:

parts production and testing
None of these
assembly automation and tool production.
a common data base and communications system
NC tape programming and automated design

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