单项选择题
A.0.001 B.0.005 C.0.01 D.0.05
A.±1% B.±2% C.±3% D.±4%
A.0.005 B.0.0025 C.0.002 D.0.001
A.0.01 B.0.05 C.0.3 D.0.5
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