Surveying
Pick up the correct statement for horizontal photographs.

All listed here
Parallel lines do not appear parallel in central projection
The two sides of a road meet at the vanishing point
The lines parallel to the negative plane are projected as parallel lines

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Surveying
Refraction correction

partially eliminates curvature correction
adds to the curvature correction
completely eliminates curvature correction
has no effect on curvature correction

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