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Yong’in eshigining yong’inga chidamliligi chegarasi o’rtasidagi farq: yong’in eshigi yong’inga qarshi eshikning yong’inga chidamliligi yaxlitligi, ya’ni yong’inga chidamlilik vaqti, joriy standart yong’inning oldini olish bo’lgan A, B, C ga bo’linadi. vaqt 1.5 soatdan kam emas, B sinf 1.0 soatdan kam emas, C sinf 0.6 soatdan kam emas.

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