Automation System
Semiconductor devices:

All of these
are less reliable than electro¬mechanical components
have a very short infant mortality period
usually have a very short MTBF (mean time between failure)
None of these

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Automation System
Numerical control:

None of these
is a method for producing an exact number of parts per hour
applies only to milling machines
All of these
is a method for controlling the operation of a machine by means of a set of instructions

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