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21/2011/TT-BKHCN pham hop … · Ký hiêu mác thép Côt bê tông duqc quy dinh trong TCVN 1651-1:2008, Thép Côt bê tông - Phân 1: Thép thanh tròn tron và TCVN 1651-2:2008,
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