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Yong’in eshiklarining turlari asosan yog’och yong’inga qarshi eshiklar va temir yong’inga qarshi eshiklarga bo’linadi. Ular uchta sinfga bo’linadi: A darajasi, B darajasi va C darajasi. Uch daraja asosan yong’inga chidamlilik vaqtining uzunligi. A sinfidagi yong’inga chidamli eshik, yong’inga chidamliligi 1.2; B sinfidagi yong’inga chidamli eshik, yong’inga chidamliligi 0.9; C sinfidagi yong’inga chidamli eshik, yong’inga chidamliligi 0.6.

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