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What deals will be available?Amazon's Big Spring Sale is all about the transition from winter to spring. Last year, we saw deals up to 40% off across 35 different categories. The bulk of the deals focus on last-chance savings on cold-weather items, as well as early savings on warm-weather activities and spring-cleaning must-haves. However, deals span across other home and tech categories as well.
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技术走通了，经济成本划算吗？在实验室的展示台上，一瓶瓶白色粉末引人注目，这是经过提纯后的氢氧化镁，纯度可达99%以上。“以前生产1公斤氢气往往需要几十元的成本。使用新技术后，每生产1公斤氢气，理论上可以联产约15公斤的高纯度氢氧化镁。”田新龙说，“通过‘一电两用’，提取镁产品的收益，基本可以覆盖制氢的成本。”此外，这项技术在常温天然海水中即可进行，大大降低了工程应用的门槛。
C++ Insights Episode 71: C++23: multidimensional operator[]Feb 18, 2026