Automation System
A technique for displaying applications where complex 3-D geometric are required for the exteror shall of a product is called:

surface modeling
2-D modeling
None of these
solid modeling
3-D modeling

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Automation System
Digital signals:

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

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