어떤 기준에서 압력관을 GA, GB, GC, GD의 네 가지 유형으로 분류하나요?？
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어떤 기준에서 압력관을 GA, GB, GC, GD의 네 가지 유형으로 분류하나요?？
TSG D3001-2009 압력관 설치 허가 규칙-부록 A 관의 분류
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