单项选择题
A.10%,30%,30% B.10%,28%,33.33% C.10%,30%,23.41% D.10%,23.41%,42.85%
A.构成比率法 B.相关比率法 C.因素分析法 D.差额计算法
A.16 B.17 C.18 D.19