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  1. Which of the following errors can be eliminated by reciprocal measurements in differential leveling? 
    I Error due to earth's curvature 
    II Error due to atmospheric refraction
    2. A.
    Both I and II
    B.
    I only
    C.
    II only
    D.
    Neither I nor II

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    Answer : Option A

    Explanation :

    -NA-

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