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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 [Wrong Answer] |
B. | on its outer spindle without a relative motion between the vernier and gra-duated scale of lower plate [Wrong Answer] |
C. | on its inner spindle with a relative motion between the vernier and the graduated scale of lower plate [Correct Answer] |
D. | on its inner spindle without a relative motion between the vernier and the graduated scale of lower plate [Wrong Answer] |