译码器的真值表如下表所示,试用74HC138实现该译码器。选择输入D C B A译码输出0 1 2 3 4 5 6 7 8 90 0 0 00 0 0 10 0 1 00 0 1 10 1 0 01 0 0 01 0 0 11 0 1 01 0 1 11 1 0 00 1 1 1 1 1 1 1 1 11 0 1 1 1 1 1 1 1 11 1 0 1 1 1 1 1 1 11 1...