Engineering Drawing
In oblique sketches, the most commonly used angles for receding lines are:

45 or 60 degrees
30 or 45 degrees
25 or 30 degrees
15 or 30 degrees

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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?

It can't be done
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
Explode the dimension and then erase the center mark

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