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USB is the most widely used external bus standard in the PC field, used to standardize the connection and communication between computers and external devices, the USB interface supports plug-and-play and hot-swappable devices. With the rapid development of computer hardware, the application of USB increases the speed of data transmission between external devices, the speed of the greatest benefit to the user means that the user can use more efficient external devices, such as the use of USB 2.0 scanner, scanning a 4M picture only 0.1 seconds or so, the work efficiency is greatly improved. USB according to different interfaces and cables, support devices: mouse, keyboard, printer, scanner, camera, flash drive, MP3 player, cell phone, digital camera, mobile hard disk, external optical floppy drive, USB network card, ADSL Modem, Cable Modem and other electronic products. DC cables are widely used in electroplating, electrolysis and testing of electronic instruments. Electroplating is the process of electrolysis to make the surface of metal or other materials attached to a layer of metal film between the process, can make the product to provide wear resistance, electrical conductivity and prevent corrosion, the process is connected through the DC cable to generate current to achieve the process of gold plating, is now widely used in the production of a number of heavy industry; Electrolysis is in our reading should have been exposed to our chemistry class will come into contact with the electrolysis experiments through the electrode and electrolyte, the use of DC cable and test electronic instruments. Electrodes and electrolytes, the use of DC line connection, through the generation of power to produce a chemical reaction, so as to prepare the required products; and in the use of DC line connection electronic instrument for testing, due to the need to be able to obtain more stable data within the specified period, so the use of direct current can achieve this purpose. DC line test electronic instrument mainly includes detection, analysis, testing of electronic products, performance, quality and safety of the Process. DC cable is a very common tool in life, but also many machines, instruments, testing indispensable tools.