单项选择题
A.±1.0% B.±1.5% C.±2.0% D.±2.5%
A.1.0% B.1.5% C.2.0% D.2.5%
A.1″ B.3″ C.5″ D.7″
A.0.5% B.1.0% C.1.5% D.2.0%
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