2617| 2
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想问下德国材料编号Steel 30MnB4和Steel SSAB boron 22对应国标的什么材料 |
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小黑屋|手机版|Archiver|机械社区 ( 京ICP备10217105号-1,京ICP证050210号,浙公网安备33038202004372号 )
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