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杨长帆相对尊敬地点头。The outer surface is plated with copper, and the raw material of the core wire is mainly iron, which is usually used for residual wire and cheap network jumper wire. The transmission interval is very close, which is attributed to the worst of the network cables of the above four raw materials. The best method of detection is to test it with a magnet, which can usually be identified by a magnetic screwdriver.4. Learn from words尹旭点点头，翻身下马，快步往院内走去。　　峰不二子从不动摇。ChannelIdPerhaps you have heard the DFU mode of iPhone. The full name of DFU is Development Firmware Upgrade, which actually means the forced upgrade and downgrade mode of iPhone firmware. For example, if there is an error (1) or error (6) when you downgrade the firmware of the iPhone, then when you restore or downgrade the firmware, you need to put your iPhone into DFU mode to completely downgrade.