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he difference of level between a point below the plane of sight and one above, is the sum of two staff readings and an error would be produced equal to. | |
A. | the distance between the zero of gradient and the foot of the staff [Wrong Answer] |
B. | twice the distance between the zero of graduation and the foot of the staff [Correct Answer] |
C. | thrice the distance between the zero of graduation and the foot of the staff [Wrong Answer] |
D. | none of the above. [Wrong Answer] |