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559:1991 TCVN 11221:2015 do Ban kÿ thuat tiêu chuan quóc gia TCVNTC 5 óng src=https:reader033vdocumentssitereader033viewer2022060706607234ea766c9d360c46d130html5thumbnails3jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 4button div class=ts-image amp-img class=ts-thumb alt=Page 4: TCVN · 2017 8 12 · TCVN 11221:2015 Lèi nói dàu TCVN 11221:2015 hoàn toàn tucng duong ISO 559:1991 TCVN 11221:2015 do Ban kÿ thuat tiêu chuan quóc gia TCVNTC 5 óng src=https:reader033vdocumentssitereader033viewer2022060706607234ea766c9d360c46d130html5thumbnails4jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 5button div class=ts-image amp-img class=ts-thumb alt=Page 5: TCVN · 2017 8 12 · TCVN 11221:2015 Lèi nói dàu TCVN 11221:2015 hoàn toàn tucng duong ISO 559:1991 TCVN 11221:2015 do Ban kÿ thuat tiêu chuan quóc gia TCVNTC 5 óng src=https:reader033vdocumentssitereader033viewer2022060706607234ea766c9d360c46d130html5thumbnails5jpg 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