Telecharger Cours

Ph?n A. TH?Y NGHI?P C? B?N - Hàng H?i K? Thu?t

- Lo?i 1 (Grade 1): ???c ch? t?o b?ng lo?i thép thông th??ng (Mild Steel). - Lo?i 2 (Grade 2): ???c ch? t?o b?ng thép ch?t l??ng cao (Special Steel).



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