8421BCD譯碼器74LS42輸出低電平有效,當(dāng)輸入時(shí),其輸出等于()
A.A B.B C.C D.D
8線-3線優(yōu)先編碼器74LS148,低電平輸入有效,反碼輸出。當(dāng)對(duì)編碼時(shí),輸出為()
A.000 B.101 C.010 D.100
A.100011 B.100001 C.00110101 D.01010011