JB/T4701-2000とHG/T20592の規格の違い
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JB/T4701-2000とHG/T20592の規格の違い：一方は機械工業の規格で、もう一方は化学工業の規格です。具体的な違いは何でしょうか
この問題については、一方が甲種突合わせフランジ（NB/T47021-212が更新されたもの）で、もう一方が管フランジ規格であり、基本的に比較の余地はありません。
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