Boshqa yong’in eshiklaridan farqli o’laroq, UL yong’inga qarshi eshiklarining aniq xususiyati shundaki, UL yong’inga qarshi eshiklar yong’inga qarshi suv bolg’asi sinovidan o’tishi kerak. Biz bilan maslahatlashish uchun xush kelibsiz.

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