[{"title":"( 2 个子文件 7.3MB ) 印制电路用覆铜箔层压板标准.rar","children":[{"title":"国标 印制电路用覆铜箔酚醛纸层压板.pdf <span style='color:#111;'> 2.05MB </span>","children":null,"spread":false},{"title":"国标 印制电路用覆铜箔复合基层压板.pdf <span style='color:#111;'> 7.46MB </span>","children":null,"spread":false}],"spread":true}]