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采用intel芯片组的四层主板印刷电路板图，曾经大量量产，虽然现在已经过时了，但对初学者而言，仍具有一定参考意义，可看到主板的布线，布局非常细致。-use intel chip set four main board printed circuit board map, have large volume production, Although it is already obsolete, but for beginners, st