d1とd2の圧力容器の違い
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d1とd2の圧力容器の違い、そしてⅠ\Ⅱはどう区別するのか
D1は第一種圧力容器を指し、D2は第二種低・中圧圧力容器を指す；具体的な分類については、「固定式圧力容器の安全技術監察規程」の付録Aを参照し、圧力レベルも付録Aに記載されている
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