THE FACT ABOUT FOUR-LAYER INNER AND OUTER LAYERS 2OZ COPPER THICK PCB CIRCUIT BOARD THAT NO ONE IS SUGGESTING

Single-sided PCB board: The solder joints are concentrated on a single aspect, and components usually are inserted on another aspect. Some products continue to have SMD components within the copper-clad aspect. Double-sided board: Both sides may be structure, and both of those may have plug-in components or SMD components.---What are the colour