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2020 선급 및 강선규칙 칙 제2편 재료 및 용접 · 2020-05-13 · (2) 규칙 5편 6장 102.의 2항 (4)호에 규정하는 배관용 탄소강관은 ks d 3507 (spp) 또는
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