A method of differential levelling is used in order to find the difference in elevation between two points when -
(a) they are too far apart
(b) there are obstacles between them
(c) the difference in elevation between them is too great
(d) all of the above.
The correct Answer Is
(d) all of the above
(a) they are too far apart
(b) there are obstacles between them
(c) the difference in elevation between them is too great
(d) all of the above.
The correct Answer Is
(d) all of the above
