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什么材料重量輕、具有較高的強(qiáng)度硬度、可加工性、成本較低 |
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評(píng)分
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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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