问题详情
若1:60,0.12ml补体为1个“实用单位”,则2个“实用单位”应为 ( )
A.1:40的补体0.2mlB.1:60的补体0.2mlC.1:20的补体0.2mlD.1:30的补体0.2mlE.1:50的补体0.2ml