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The distinguishing symbol for a projection system is drawn as

  • A.two views of a truncated cone
  • B.a circle inscribed in a square
  • C.a pair of crossed diagonal lines
  • D.three concentric circles of unequal radius

Answer: A

The frustum's two views appear in different relative positions in the two systems, which identifies the convention at a glance. Placing it in the title block is mandatory, since the same drawing means different things under each.

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