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  1. In reciprocal levelling, the error which is not completely eliminated, is due to
    2. A.

    earth's curvature
    B.

    non-adjustment of line of collimation
    C.

    refraction
    D.

    non-adjustment of the bubble tube.

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    Workspace

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    Answer : Option C

    Explanation :

    No answer description available for this question. 

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