Surveying
The distance between the minor control point and the principal point should be equal to

Base line of the right photograph of stereo pair
Mean of the base lines of the stereo pair
Sum of the base lines of stereo pair
Base line of the left photograph of stereo pair

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Surveying
Pick up the correct statement for horizontal photographs.

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

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