Surveying
Different grades are joined together by a

Reverse curve
Compound curve
Vertical curve
Transition curve

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Surveying
Theodolite is an instrument used for

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

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Surveying
The First Point of Aeries

Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda
Is usually denoted by the Greek letter ?
All listed here
Is the point in the celestial sphere where zero meridian crosses the celestial equator

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