单项选择题
A.±0.5% B.±1.0% C.±1.5% D.±2.0%
A.0.5% B.1.0% C.1.5% D.2.0%
A.1级 B.2级 C.3级 D.4级
A.±1.0% B.±1.5% C.±2.0% D.±2.5%
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