单项选择题A.将1接7或8,2接5或3,4接7,6接9B.将1接3或5,2接5或3,4接7,6接8、9C.将1接3或5,2接6或8,4接7,6接9D.将1接9,2接5或3,4接7,6接8
单项选择题A.全加器B.半加器C.译码器