Po’latdan yasalgan yong’inga qarshi eshiklarning turli xil yong’inga chidamliligiga ko’ra, ularning yong’inga chidamliligi uchta sinfga bo’linishi mumkin: A, B va C. Turli darajadagi po’lat yong’inga qarshi eshiklar turli joylarda ishlatilishi mumkin.

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