Engineering Drawing
These are special installations of stone or concrete marking the locations of points accurately determined by precise surveying:

Hatches
Pillars
Monuments
Topographic marks

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

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