Question: Pick up the correct statement from the following : A. the tangent screw enables to give small movement under conditions of smooth and positive control

Pick up the correct statement from the following :

A.

the tangent screw enables to give small movement under conditions of smooth and positive control

B.

standing on the tripod is the levelling head or trib arch

C.

the levelling screws are used to tilt the instrument so that its rotation axis is truly vertical

D.

all the above.

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