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Po’lat yong’inga qarshi eshiklarning turli xil yong’inga chidamliligiga ko’ra, ularning yong’inga chidamliligi uchta sinfga bo’linishi mumkin: A, B va c. Har xil turdagi po’lat yong’in eshiklari turli joylarda ishlatilishi mumkin.

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