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One of these four is not a reason to use layers. Which is it?

  • A.to control line types by category
  • B.to turn categories of detail off when not wanted
  • C.to plot some categories and suppress others
  • D.to store the drawing at more than one scale

Answer: D

Correct answer: to store the drawing at more than one scale

Layers control category, not scale: they group entities so that line types, colours and visibility can be set together, and so that some categories can be plotted while others are suppressed. Scale is a property of the plot, and geometry should be drawn full size whatever it is eventually plotted at.

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