A.+4.00DS/+2.50DC x45B.+4.00DS/+2.50DC×135C.+2.50DS/+4.00DC x45D.+2.50DS/+4.00DCx135
A.0.025B.0.0125C.0.05D.0.01
A.商朝B.周朝C.秦朝D.汉朝