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Keeping the instrument height as 1.5 m, length of staff 4 m, the slope of the ground as 1 in 10, the sight on the down-slope, must be less than. | |
A. | 30 m [Wrong Answer] |
B. | 25 m [Correct Answer] |
C. | 20 m [Wrong Answer] |
D. | 15 m [Wrong Answer] |