Surveying
The equation which is obtained by multiplying each equation by the coefficient of its unknowns and by adding the equations thus formed, is known as

Observation equation
Conditional equation
Normal equation
None of these

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Surveying
Contour interval is

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

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