Surveying
Pick up the correct statement for horizontal photographs.

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

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Surveying
The necessary geometrical condition for triangulation adjustment is:

The sum of the three angles of a plane triangle should be 180°
The sum of the eight angles of a braced quadrilateral should be 360°
The sum of the angles around a station should be 360°
All listed here

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