A sinfidagi yong’inga chidamli eshik faqat 1.5 soat yong’inga chidamlilik chegarasiga yetishi mumkin va faqat maxsus jarayon bilan tayyorlangan yong’inga chidamli eshik 3 soatlik yong’inga chidamlilik talabiga javob berishi mumkin.

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