单项选择题
A.≥1% B.≥1.5% C.>1% D.≥0.5%
A.>0.5% B.≥0.5% C.>1% D.≥1.5%
A.0.0021%B.0.0023%C.0.0024%D.0.0025%
A.100 B.200 C.300 D.400
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