Automation System
Which of the following symbol modes are used to input of graphics to General CAD system?

Dimension and Alphanumeric mode
None of these
Arc and Circle mode
All of these
Live and Rectangle mode

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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
None of these
have a sinusoidal shape.
can have three possible levels

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