At the same time, the resistance of the IPCD in product group 1 and the IPCD in product group 2 are compared, and the stronger IPCD is selected as the IPCD in product group 1.
At the same time compare the product family 1 IPCD and product family 2 ipCD resistance size, choose the stronger resistance of IPCD as the product family 1 IPCD
At the same time, the resistance of IPCD in product family 1 is compared with that in product family 2, and the IPCD with stronger resistance is selected as the IPCD in product family 1