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Surveying

Q1: Pick up the correct statement from the following :

A the lines of sight while observing back sight and fore sight lie in the same horizontal plane

B the staff readings are measurements made vertically downwards from a horizontal plane

C the horizontal plane with reference to which staff readings are taken, coincides with the level surface through the telescope axis

D all the above.

ANS:D - all the above.

Will the measurements be always vertically downwards, as in operation B. Can anyone please tell me?



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