Electronic equipment manufacturers usually use electromagnetic interference (EMI) and radio frequency interference (RFI) shielding measures to protect sensitive digital circuits from external radiation, and also limit the potentially harmful radiation emitted by their products.
Read MoreUsually referred to as etching or photochemical etching, it refers to removing the protective film of the area to be etched after exposure to plate making and development, and contacting the chemical solution during etching to achieve the effect of dissolving corrosion and forming irregularities or......
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