| 摘要 |
<p>The board has an elementary printed circuit board (10) provided with two external faces (13, 16) and metal holes (31, 32) that allow interconnection of the two external faces, where the metal holes are blocked by closures (33, 34). Another elementary printed circuit board (11) is provided with metal holes (37, 38) that permit inter-connection of two external faces (20, 21) of the latter elementary printed circuit board. The external faces of the latter elementary printed circuit board are covered with tin based metal deposit that is made of gold.</p> |
