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Yong’in eshigini ulash eshigini yopish katta rol o’ynaydi. Yong’in eshigi yopilganda, eshik yaqinroq to’g’ridan-to’g’ri faollashadi va eshikni yopish to’g’ridan-to’g’ri yopilishi mumkin, bu kuchli muhrlanish ta’siriga ega bo’lishi va yong’in manbasini samarali izolyatsiya qilishi mumkin. Va nisbatan qattiq.

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