Engineering Drawing
PDM is the acronym for:

Product drawing manipulation
Project data manipulation
Product data management
Project drawing management

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

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