Surveying
International Date Line is located along

Standard meridian
Greenwich meridian
180° longitude
Equator

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Surveying
Accidental errors

All of these
Are generally small
Do not follow any definite mathematical law
Cannot be removed by applying corrections to the observed values

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Surveying
The necessary geometrical condition for triangulation adjustment is:

All listed here
The sum of the angles around a station should be 360°
The sum of the eight angles of a braced quadrilateral should be 360°
The sum of the three angles of a plane triangle should be 180°

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