Arrangement,also known as soft circuit board(FPC).It is in accordance with the provisions of the industry norms of the line rules, line order,line color, line number,etc.,for the data transmission of moving parts and active areas, such as the computer internal motherboard connected to the hard disk, the data line of the optical drive, the data line of the mobile phone motherboard connected to the display screen,and the data line between the connected devices are collectively referred to as the line.