Surveying
The angle between the prolongation of the preceding line and the forward line of a traverse is called

None of these
included angle
direct angle
deflection angle

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Surveying
Systematic errors

Can be removed by applying corrections to the observed values
Always follow some definite mathematical law
All listed here
Are also known as cumulative errors

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Surveying
Refraction correction

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

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