If the lower clamp screw is tightened and upper clamp screw is loosened, the theodolite may be rotated____________?
(A) on its outer spindle with a relative motion between the vernier and graduated scale of lower plate
(B) on its outer spindle without a relative motion between the vernier and gra-duated scale of lower plate
(C) on its inner spindle with a relative motion between the vernier and the graduated scale of lower plate
(D) on its inner spindle without a relative motion between the vernier and the graduated scale of lower plate
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