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23 分钟
Precious Metals: What’s Their Role As Experts “Flipflop” on Recession?
In July 2022, Michael Gapen, chief U.S. economist at Bank of America, warned that a recession was soon to hit the U.S.
28 分钟
《科学》(20240920出版)一周论文导读
引力波探测器使用数公里长的干涉仪来测量时空的微小膨胀和收缩。由于量子力学的原因,这些测量的精度是有限的。理论上,利用光的压缩态可以超越量子极限,而合适的滤光腔可以在更宽的频率范围内扩展这一优势。
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