单项选择题
A.10%～20% B.20%～30% C.30%～40% D.40%～50%
A.3001x B.1501x C.1001x D.501x
A.5001x B.3001x C.2001x D.1501x
A.0.6～0.9 B.0.3～0.8 C.0.1～0.5 D.0.2～0.6
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