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The elevation of a horizontal trace lies

  • A.on the reference line
  • B.above the reference line
  • C.below the reference line
  • D.at the same height as the line's midpoint

Answer: A

The trace is a point in the horizontal plane, so its height above that plane is zero and its elevation cannot leave the line. Locating it is a matter of producing the elevation of the line until it meets the reference line.

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