Surveying
An imaginary line lying throughout the surface of ground and preserving a constant inclination to the horizontal is known as

contour line
contour interval
horizontal equivalent
contour gradient

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Surveying
Pick up the correct statement from the following. The difference between the longitudes of the places is obtained.

By subtracting the sum of their longitudes exceeding 180° from 360° if places are in different hemispheres
All of these
By adding their longitudes if places are in the different hemispheres
By subtracting their longitudes if places are in the same hemisphere

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Surveying
Pick up the correct statement for horizontal photographs.

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

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