单项选择题
A.D≥12d B.D≥14d C.D≥16d D.D≥18d
A.D≥15d B.D≥16d C.D≥17d D.D≥18d
A.5% B.8% C.9% D.10%
A.10% B.15% C.20% D.30%
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