单项选择题
A.0.5% B.1% C.7% D.8% E.10%
A.2% B.5% C.6% D.8% E.10%
A.5% B.8% C.10% D.15% E.20%
A.15%，8% B.15%，10% C.15%，15% D.20%，10% E.20%，15%
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