单项选择题
A.0.45% B.4.5% C.45% D.0.045%
A.0.08% B.0.8% C.8% D.80%
A.小于3% B.小于5% C.5%～10% D.大于10%
A.小于0.25% B.0.25％～0.6% C.0.4% D.0.6%
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