Yong’inda xavfsizlik muhimroqdir, singan bo’lakdagi yuqori sifatli o’t o’chirish oynasi o’tmas holatda, uning bo’laklari temperli bo’lishi kerak shisha parchalari kichikroq, ya’ni shikastlangan bo’lsa ham, inson tanasiga zarar etkazmaydi.

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