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| Q. |
Which of the following statement is correct? |
| A. | In levelling, the effect of curvature is to decrease the staff reading. |
| B. | The effect of refraction in levelling is to increase the staff reading. |
| C. | The combined effect of curvature and refraction in levelling is to increase the staff reading. |
| D. | all of the above |
| Answer» C. The combined effect of curvature and refraction in levelling is to increase the staff reading. | |
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