Automation System
Digital signals:

are assigned values of 1 or 0 depending on the voltage level
have a frequency measured in units of hertz
have a sinusoidal shape.
can have three possible levels
None of these

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Automation System
CAE and CAM are linked through:

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

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