单项选择题
A.1% B.2% C.3% D.4%
A.1m;2m;5m B.0.1m;0.2m;0.5m C.0.01m;0.02m;0.05m D.0.001m;0.002m;0.005m
A.1/4911 B.1/6548 C.1/3929 D.1/4000
A.±4″ B.±3″ C.±5″ D.±6″
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