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2. Ph?m vi ?ng d?ng. Nh cng nghi?pNh nh?p l?nKhung nh nhi?u t?ngC?u du?ng b?, du?ng s?tK?t c?u thp caoK?t c?u b?nCc lo?i k?t c?u di d?ng* So snh cc phuong n TK. 3. Yu c?u d?i v?i k?t c?u thp. Yu c?u v? s? d?ng: an ton, b?n, d?pYu c?u v? kinh t?: Ti?t ki?m, cng ngh? ch? t?o, th
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