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　　　　In the SMT patch processing of circuit boards, welding and tinning is a key stage, which is related to the performance in

　　　　I. Introduction　　The copper-free hole is also called the via hole, which belongs to the functional problem of the PCB cir

　　　　At present, the design of high-speed pcb circuit boards is widely used in communications, computers, graphics and image p

　　　　In fact, the red glue process can improve the efficiency of post-soldering. There are still many people who do this proce

　　　　Before the advent of printed circuit boards, the interconnections between electronic components depended on the direct co

　　　　1. The circuit board is not energized, it may be that the components in the circuit board are soldered or unsoldered, res