Surveying
23 cm × 23 cm photographs are taken from a flying height with a camera of focal length of 3600 m and 15.23 cm respectively. A parallax difference of 0.01 mm represents

1 m
4 m
2 m
3 m

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Surveying
Pick up the incorrect statement from the following. In a spherical triangle

Sum of the three angles is equal to two right angles
Every angle is less than two right angles
Sum of any two sides is greater than the third
Sum of the three angles less than six right angles and greater than two right angles

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