Nrog rau kev loj hlob sai ntawm PCB kev lag luam, PCB yog maj mam txav mus rau cov kev taw qhia ntawm high-precision nyias kab, me me apertures, thiab siab nam piv (6: 1-10: 1).Qhov kev xav tau ntawm qhov tooj liab yog 20-25Um, thiab DF kab sib nrug tsawg dua 4mil.Feem ntau, PCB cov tuam txhab tsim khoom ...
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