Surveying
If the staff is not held vertical at a level¬ling station, the reduced level calculated from the observation would be

less than true R.L.
None of these
true R.L.
more than true R.L.

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Surveying
Circumpolar stars

Remain always above the horizon
Rotate round the North Pole
Are seldom seen near the pole star
Rotate round the celestial pole

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