Engineering Drawing
On typical electronic diagrams, these items need not be shown unless they are needed for clarification:

Terminal circles
Operating relays
Closed relays
Transmission diagrams

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Engineering Drawing
How can the drafter prevent Auto-CAD from placing or stacking another center mark on a circle when adding a diameter dimension to it?

Explode the dimension and then erase the center mark
Use the trim tool to take away the stacked center mark
Use the Properties dialog box to turn off the center mark of the dimension
It can't be done

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