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什么材質(zhì)的鋼鐵柔韌性高不易折斷甚至是有記憶功能? |
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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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