1) When the resistance of the inner ring is small and the resistance of the outer ring is large, the oxygen flux of the coating can be appropriately increased, and the oxygen is increased by 1 for every 5 ohms of resistance difference.<br> 2) When the resistance of the inner ring is large and the resistance of the outer ring is small, the oxygen intake of the coating can be appropriately reduced, and the oxygen is reduced by 1 for every 5 ohms difference in resistance.
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