Automation System
Digital signals:

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

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Automation System
A common data base is one requisite for converting CAD and CAM to CIM. Another is that:

None of these
the system must make provision for new techniques.
the user must have access to both hardware and software
technical assistance must be provided to the user.
there should be a common 3-D part description system.

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