单项选择题
A.±0.5° B.±1° C.±1.5° D.±2.8°
A.0.5% B.1% C.1.5% D.2%
A.1根 B.2根 C.3根 D.4根
A.±0.1° B.±0.5° C.±1.0° D.±1.5°
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