Surveying
G.M.T. corresponding to given mean time, equals

L.M.T. - West longitude in time
L.M.T. + East longitude in time
None of these
L.M.T. - East longitude in time

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Surveying
Contour interval is

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

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