由4位数值比较器74LS85构成的电路,其中A 3 A 2 A 1 A 0 输入的是8421BCD码,如果LED被点亮,说明输入A 3 A 2 A 1 A 0 对应的十进制数为
A.
4~9
B.
5~9
C.
0~4
D.
5~10
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