Automation System
Digital signals:

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

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Automation System
Straight-line operations:

All of these
must be limited to two per workpiece
None of these
must be parallel to one of the axes of the coordinate system
can include diagonal cuts if they aren't curved

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