3643| 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,? |
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點評
3mm的外徑,,是有點小了,,做成空心也不劃算了。
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小黑屋|手機版|Archiver|機械社區(qū) ( 京ICP備10217105號-1,,京ICP證050210號,,浙公網(wǎng)安備33038202004372號 )
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