单项选择题
A.0.7,0.7B.0.8,0.8C.0.7,0.8D.0.8,0.7
A.Cb20,2.0B.Cb20,1.5C.Cb25,2.0D.Cb25,1.5
A.Mb5,M5B.Mb7.5,M7.5C.Mb5,M7.5D.Mb10,M5