Engineering Drawing
This type of rapid prototyping system uses a laser to fuse powdered metals, plastics, or ceramics:

Solid ground curing
Selective laser sintering
Stereo lithography apparatus
Fused deposition modeling

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Engineering Drawing
Traditional drafters need to be able to create several different line widths because ________.

It makes no difference
The line width has to do with how dark it appear in the finished drawing
They seem to transmit better in a fax machine
Different line widths convey different information

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