パイプ等級表Weldoletの記述上の問題
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この投稿は最後にjacques0920によって2016-3-21 08:06に編集されました。皆さん、HDR/BRNという略語を見かけましたが、これが何を意味するかご存知ですか？ ありがとう。
HDR=HEADER、責任者； BRN=BRANCH、支管。
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