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微软表示,一块 120mm 见方、2mm 厚的硅酸硼玻璃可存储约 4.8TB 数据,相当于约 200 万本印刷书籍的内容。团队在加速老化实验中推算,在 290℃ 条件下数据可保存 1 万年以上,而在室温下寿命将更长。
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Раскрыты подробности похищения ребенка в Смоленске09:27。业内人士推荐同城约会作为进阶阅读
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One reason for routinely launching GPS satellites is simply "constellation replenishment," said Col. Andrew Menschner, deputy commander of the Space Force's Space Systems Command. Old satellites degrade and die, and new ones need to go up and replace them. At least 24 GPS satellites are needed for global coverage, and having additional satellites in the fleet can improve navigation precision. Today, there are 31 GPS satellites in operational service, flying more than 12,000 miles (20,000 kilometers) above the Earth.