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Pick up the correct statement from the following : | |
A. | the tangent screw enables to give small movement under conditions of smooth and positive control [Wrong Answer] |
B. | standing on the tripod is the levelling head or trib arch [Wrong Answer] |
C. | the levelling screws are used to tilt the instrument so that its rotation axis is truly vertical [Wrong Answer] |
D. | all the above. [Correct Answer] |