搜索 - 科创

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看了一下ebay，好像没有我想象中那么贵。确实如果有八九k欧元或美金，运气优秀是可能搞到一套beam能开起来的古代SEM的。但是SEM这东西是需要维护的，stage是会卡住的，filament甚至FE...

目录 1. 触电简介 2. 交流电与直流电 3. 交流电频率1. 触电简介电流直接经过人体的现象叫触电(electric shock)。触电对于人的身体和内部组织就能造成不同程度的...

太空承载了中国人对星辰大海的无尽想象和无尽探索。当北斗列阵，神舟飞驰，天舟往返，天宫建成之时，我想:我爱上了航天。从两三年前的玩火烧药。到去科创论坛看文献，去软件设计发动机，出成品，再到出火箭“尽管没...

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