单项选择题
A.±0.12D B.±0.18D C.±0.25D D.±0.37D
A.±0.37D B.±0.25D C.10.18D D.±0.12D
A.±0.50D B.±0.37D C.±0.12D D.±0.25D
A.±8° B.±4° C.±6° D.±2°
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