请问如何分离地层呢?
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看一下这几个链接
wenku.baidu.com/.../a296e2d68662caaedd3383c4bb4cf7ec4afeb63e.html
如何正确使用PCB的分层和堆叠
wenku.baidu.com/.../6489d3e0b52acfc788ebc92a.html
PCB叠层结构参考即多层板叠层建议