Surveying
The difference of levels between two stations A and B is to be determined. For best results, the instrument station should be

closer to the higher station
equidistant from A and B
closer to the lower station
as far as possible from the line AB

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Surveying
Pick up the correct statement for horizontal photographs.

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

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