单项选择题
A.41.46% B.42.52% C.35.84% D.33.97%
A.A1B1C2D2 B.A2B2C1D1 C.A2B1C2D2 D.A1B2C1D2
A.A,B,C B.C,A×B,B,D C.C,A×B D.C,A×B,B