依頼基準BTGC001-2015
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規格：BTGC001-2015
それはどこの規格ですか？
それはどこの規格ですか？*学*を学びたい。
宝鋼の10#～70#炭素構造鋼の精密引き線材規格のはずです。前版はBTGC001-2011で、手元にはありません
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