Engineering Drawing
Before starting an isometric drawing in Auto-CAD the drafter needs to ________.

Turn Ortho off
Set the current layer to Def-points
Set the grid to isometric
Turn Object Snap off

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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?

Explode the dimension and then erase the center mark
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

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