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The functional earth is used for interference suppression. It is a low-impedance current path between the circuitry and earth and is only used to improve the equipment's performance and not (!) for protective purposes.
A Functional region is a place that relies on the core city for the most part. They still do need support from the outer smaller cities but get most of their help from the bigger most thriving cities. Answer 2. A type of region characterized by its function.