Negative is used to reduce the size of the file to reduce the amount of calculation. There is place where copper does not show, no place where copper is displayed. This layer in the ground layer can significantly reduce the amount of data and computer display burden. But now the computer configuration on this workload has been nothing, I think it is not recommended negative use, easy mistakes. The pad is not designed to have a short circuit.
Power splitting convenient, then there are many ways, positive film can also be used to facilitate the other methods of power segmentation, no need to use negative film.
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