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1. |
In surveying optical square is used to setting out right angles. The horizon glass is placed at an angle of ______ with the horizon sight and index glass is placed at an angle of ______ with the index sight. |
A. | 30˚ and 15˚ |
B. | 60˚and 45˚ |
C. | 90˚and 75˚ |
D. | 120˚ and 105˚ |
Answer» E. | |