单项选择题
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%
A.70%,30% B.80%,20% C.90%,10% D.85%,15% E.75%,25%
A.1:2 B.1:3 C.1:4 D.1:5 E.1:6
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