- 18
- Mar
90 daqiqa yong’inga chidamli tashqi eshik, panjurli yong’inga chidamli po’lat eshik, belanchak turi ikki bargli yong’in xonasi eshigi
Po’lat yong’inga qarshi eshiklarning yong’inga chidamliligi har xil bo’lib, ularning yong’inga chidamliligi uchta sinfga bo’linishi mumkin: A, B va C.
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