2881| 9
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中国极硬材料合成再获突破 硬度两倍于金刚石 |
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点评
好像之前看书有看到过
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Archiver|手机版|小黑屋|机械社区 ( 京ICP备10217105号-1,京ICP证050210号,浙公网安备33038202004372号 )
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