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现在PD充电器已经比较普及了，很适合在空间不大的桌面上或者非实验室环境当作一个多电压电源的替代品。不过大多数PD sink项目要么太简单，使用拨码开关这种不是很直观的操作方式；要么稍显复杂，需要使用单...

这部分内容是教如何使用聚酯树脂做标本的。这种树脂和上面的水晶滴胶是不同的。水晶滴胶和聚酯树脂都能用来做标本，但用聚酯树脂做出来的工艺简单效果更好但是切记要做好防护。因为我聚酯树脂是amazon上买的，...

史瓦西　　K·史瓦西(1873～1916) 　　Karl Schwarzschild 　　德国天文学家，物理学家。1873年10月9日生于法兰克福，1916年5月11日卒于波茨坦。他16岁时写出关于三...

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