五大過孔工藝1.過孔蓋油通孔覆蓋油的“油”是指阻焊油,通孔覆蓋油用阻焊油墨覆蓋過孔的孔環。professional pcb manufacturing通孔蓋油的目的是絕緣,所以要保證孔圈的油墨蓋完整,...
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