A.a3+a2+a1+a0 B.a3⊕a2⊕a1⊕a0⊕1 C.a3⊕a2⊕a1⊕a0 D.
A.計(jì)數(shù)器和譯碼器B.計(jì)數(shù)器和全加器C.計(jì)數(shù)器和編碼器D.移位寄存器和編碼器
A.8 B.6 C.3 D.4