Surveying
The relief displacement of a building 72 m high on photograph is 7.2 mm and its top appears 10 cm away from principal point. The flying height of the camera, is

1000 m
1500 m
500 m
2000 m

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Surveying
Circumpolar stars

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

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