Surveying
Triangulation surveys are carried out for locating

Control points for photogrammetric surveys
Engineering works, i.e. terminal points of long tunnels, bridge abutments, etc.
All of these
Control points for surveys of large areas

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Surveying
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

error due to displacement of station signals
error due to eccentricity of verniers
error due to wrong adjustment of line of collimation and trunnion axis
error due to inaccurate graduation

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