Engineering Drawing
Schematic and single-line diagrams should be arranged so that signal or transmission path from input to output proceeds in this fashion:

Right to left and top to bottom
Right to left and bottom to top
Left to right and bottom to top
Left to right and top to bottom

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

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

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