4035| 9
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哪一種圓鋼可以滿足,要求受到一定壓力不會變形? |
點評
3mm的外徑,是有點小了,做成空心也不劃算了。
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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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