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1. |
Which one of the following specifications for length of base line refers to Third Order Triangulation system ? |
A. | 0.5 to 3 km |
B. | 1.5 to 4 km |
C. | 5 to 15 km |
D. | 10 to 20 km |
Answer» B. 1.5 to 4 km | |