2989| 2
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想問下德國材料編號Steel 30MnB4和Steel SSAB boron 22對應國標的什么材料 |
Archiver|手機版|小黑屋|機械社區 ( 京ICP備10217105號-1,京ICP證050210號,浙公網安備33038202004372號 )
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