Surveying
A ’level line’ is a

line passing through the objective lens and the eye-piece of a dumpy or tilting level
line passing through the center of cross hairs and the center of eye piece
horizontal line
line parallel to the mean spheriodal surface of earth

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Surveying
Pick up the correct statement for horizontal photographs.

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

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