• 1. 通孔用: ZET-P
• 2. 交通用人孔: access manhole
• 3. 通用打孔机: universal punching machine

更多释义

• 1.综述了一种对印制线路板通孔镀的方法，即在孔壁上沉积有电镀用的碳黑—石墨层，以取代传统的化学镀铜工艺。
  A process for through hole plating is reviewed in which conventional electroless copper plating is replaced by deposition of a carbon black-graphite layer.
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