单项选择题
A.二层 B.三层 C.四层 D.五层
A.20%,80% B.30%,70% C.40%,60% D.50%,50%
A.0.4 B.0.5 C.0.6 D.0.7
A.80%,20% B.70%,30% C.60%,40% D.50%,50%
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