- 15
- Mar
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Chelik yong’in eshiklari va eshiklari qalinligi bo’yicha uchta standartga bo’linishi mumkin. Standart qanchalik baland bo’lsa, yong’in eshigining ovoz yalıtımı va issiqlik izolyatsiyasi ta’siri shunchalik yaxshi bo’ladi.
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