Surveying
There are two stations A and B. Which of the following statements is correct?

The fore and back bearings of AB differ by 180°
The fore bearing of AB is AB
The back bearing of AB is BA
All listed here

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Surveying
Contour interval is

Larger if the time available is more
Directly proportional to the flatness of ground
Larger for accurate works
Inversely proportional to the scale of the map

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