单项选择题
A.0.45～0.55 B.0.45～0.50 C.0.40～0.50 D.0.90～0.95
A.10%～20% B.15%～25% C.20%～25% D.20%～30%
A.33% B.25% C.15% D.5%
A.25% B.50% C.75% D.100%
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