Engineering Drawing
This type of surface is tipped to all principal planes of projection and does not appear true size in any standard view:

Parallel
Oblique
Foreshortened
Orthographic

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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?

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

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