单项选择题
A.10%～20% B.30%～60% C.40%～50% D.50%～70%
A.25% B.70% C.50% D.85%
A.60%～70% B.20%～30% C.30%～40% D.10%～30%
A.25% B.5% C.3% D.13%
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