单项选择题
A.1个月 B.2个月 C.3个月 D.半个月
A.10% B.20% C.30% D.50% E.60%
A.一样 B.60-80% C.50-70% D.30-50% E.40-60%
A.一样 B.20% C.30% D.50% E.60%
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