8143| 6
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45號(hào)鋼直徑為48的螺桿需要調(diào)質(zhì),調(diào)質(zhì)后其硬度于拉力能達(dá)到8.8級(jí)的嗎、要求嗎?》 |
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小黑屋|手機(jī)版|Archiver|機(jī)械社區(qū) ( 京ICP備10217105號(hào)-1,京ICP證050210號(hào),浙公網(wǎng)安備33038202004372號(hào) )
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