コース設計 管径の計算は16.9mm、四捨五入して18mmとする。規格32の熱間圧延鋼を使用するか、規格18の冷間…
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コース設計 管径の計算：16.9mm。四捨五入して18mmとする。規格32の熱間圧延鋼を使用するか、それとも規格18の冷間圧延鋼を使用するか？
流体輸送用シームレス管GB/T8163-2008
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