含有七人表决器，格雷码变换电路，英文字符显示电路，基本触发器（D和JK），74LS160计数器功能模块，步长可变的加减计数器-Containing seven people vote, and Gray code conversion circuit, the English characters display circuit, the basic flip-flop (D and JK), 74LS160 counter funct