单项选择题
A.0-10% B.0-15% C.0-20% D.0-25%
A.5-10% B.10-20% C.15-20% D.15-25%
A.14-30% B.15-30% C.16-30% D.18-30%
A.大于30% B.大于40% C.大于50% D.大于60%
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