搜索 - 科创

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更正：Jasper应译为碧石，而不是碧玉。一些书上误称为碧玉，碧玉是软玉的一种。在化石网见到一些很精简的解释，摘要点录于此，供考：玉髓可分为普通玉髓、玛瑙、碧石三类。......。碧石，指成分中含有粘...

引用 HXKRRRR:引用 power_rdx:引用 HXKRRRR:引用 power_rdx:这个不难理解，两方面解释。一方面，结构上说，喷气发动机压气机部分叶轮数量和压缩比要高于燃烧室部分，所以在...

引用第17楼hambaby于2008-08-24 02:31发表的 :国人的盗版反动能量是无限的，现在市面上满大街都是的压电陶瓷片+谐振腔+电路一体化的高响度低成本报警器，原创者在这里：http:/...

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