EMC 乘除法运算 （四节除以两节、四字街除以单字节、三字节除以两字节、适合于双字节除以双字节、双字节除以单字节、单字节除以单子节） -EMC computing multiplication and division (4 divided by 2, divided by the number of single-byte characters Street, the three bytes divided by two bytes, suitable for double-byte divi