Surveying
The great circle whose plane is perpendicular to the axis of rotation of the earth, is called

Terrestrial equator
All of these
Equator
0° latitude

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Surveying
Theodolite is an instrument used for

measurement of vertical angles only
measurement of both horizontal and vertical angles
tightening the capstan-headed nuts of level tube
measurement of horizontal angles only

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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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