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A point on the reference line lies

  • A.in neither of the two principal planes
  • B.in both principal planes at once
  • C.in the horizontal plane only
  • D.in the vertical plane only

Answer: B

Only a point on the line of intersection can have zero height and zero distance from the vertical plane at once, so both its views coincide there. It is the single position at which plan and elevation are the same point.

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