Engineering Drawing
This type of surface may be a plane, a single curved surface, or a warped surface:

Auxiliary surface
Ruled surface
Developed surface
Edge surface

ANSWER DOWNLOAD EXAMIANS APP

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 Properties dialog box to turn off the center mark of the dimension
Use the trim tool to take away the stacked center mark
Explode the dimension and then erase the center mark

ANSWER DOWNLOAD EXAMIANS APP