为什么选d啊。数字电路的，74x85比较器

选d啊数字电路74x85比较器If a 74x85 magnitude comparator has ALTBIN=1, AGTBIN=0, AEQBIN=0, A3A2A1A0=1101, B3B2B1B0=0111 on its inputs, the outputs are ( D ). A) ALTBOUT=0, AEQBOUT=0, AGTBOUT=0 B) ALTBOUT=1, AEQBOUT=0, AGTBOUT=0 C) ALTBOUT=1, AEQBOUT=0, AGTBOUT=1 D) ALTBOUT=0, AEQBOUT=0, AGTBOUT=1

A3A2A1A0=1101；B3B2B1B0=0111；显 A>B 嘛 A GT B OUT=1；级联信号都自于低位比较本级比较结相等自低位比较结才影响终结；本级比较结相等自低位比较结没意义忽略；