Surveying
A plate parallel is the line on the plane of the negative

None of these
Along the bisector of the angle between the principal line and a perpendicular line through principal plane
Perpendicular to the principal line
Parallel to the principal line

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Surveying
Theodolite is an instrument used for

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

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