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What is the principal advantage of CAD over manual drafting?

  • A.a drawing can be modified without being redrawn
  • B.the resulting drawing needs no dimensions to be added
  • C.the geometry is guaranteed correct without any checking
  • D.the draughtsman need not understand projection conventions

Answer: A

Editing an existing geometry costs a fraction of redrawing it, which is what makes revision and design iteration practical. The conventions of projection, sectioning and dimensioning apply exactly as they did on the board, since the reader of the drawing has not changed.

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