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　　　　1. Record the original sample before copying the board, which is a series of work. Poor handling of the previous process

　　　　For a long time, glass substrates and PCB boards have maintained a "clearly different" situation, and have play

　　　　In terms of electrical performance, it includes dielectric constant and loss angle, ① dielectric constant or dielectric c

　　　1. Function of conducting hole: It only serves as an electrical interconnection, and the aperture can be as small as poss

　　　　The main function of a PCB board is to provide connections and support between electronic components, and different wirin

　　　　1. Filtering principle: PCB filter elements mainly use activated carbon as the filtering medium to remove residual chlori