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two points A and B are 2000 meters each away from point C, from which the measured vertical angle to A is 1 degree and 30 minutes and to B is -2...

two points A and B are 2000 meters each away from point C, from which the measured vertical angle to A is 1 degree and 30 minutes and to B is -2 degree and 30 minutes. considering the effect of the earth curvature and refraction

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