Yong’in eshigi barglari soni uchta holatga bo’linishi mumkin: bitta eshik, ikkita eshik va to’rt eshik. A sinfidagi po’latdan yasalgan yong’inga qarshi eshikka ko’ra, yong’inga chidamlilik vaqti 90 daqiqaga yetishi mumkin.

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