Yong’in eshigi o’rnatilgandan va yopilgandan so’ng, bo’shliq juda katta bo’lmasligi kerak, aks holda yong’in eshigining muhrlanishini kafolatlash qiyin va yong’in sharoitida yong’in va tutun gazining tarqalishini oldini olish funktsiyasini aks ettirish qiyin. .

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