Surveying
If 16 flight lines are run perpendicular to an area 30 km wide, their spacings on a photographical map on scale 1 : 50,000 , will be

4 cm
1 cm
2 cm
3 cm

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Surveying
Refraction correction

completely eliminates curvature correction
adds to the curvature correction
has no effect on curvature correction
partially eliminates curvature correction

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