单项选择题
A.大于0.25%B.大于0.40%C.小于0.60%D.大于0.60%
A.3% B.5% C.7% D.10%
A.3%B.5%C.7%D.10%
A.小于0.25% B.大于0.25% C.小于0，60% D.大于0.60%
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