A.((AB)’(BC’)’(BD)’)’B.((AB)’(BC’)’(B’D)’)’C. ((AB)’(BC’)’(BCD’)’)’D.((AB)’(BC’)’(BD’)’)’
A.計(jì)數(shù)器只能用于對(duì)時(shí)鐘脈沖計(jì)數(shù) B.計(jì)數(shù)器具有定時(shí)功能 C.可逆計(jì)數(shù)器既能進(jìn)行遞增計(jì)數(shù)又能進(jìn)行遞減計(jì)數(shù)