Engineering Drawing
This type of section is not in direct projection from the view containing the cutting plane:

Broken-out section
Revolved section
Full section
Removed section

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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
Use the trim tool to take away the stacked center mark
It can't be done
Explode the dimension and then erase the center mark

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