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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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