- Domeniu: Education
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Harvard University is the oldest institution of higher learning in the United States. It was established in 1636 by the Massachusetts legislature and named after its first benefactor, John Harvard. Located in Cambridge, Massachusetts, Harvard University is an Ivy League university.
电离辐射照射的单位。它是这一数量的 γ 或 x 射线产生离子在 1 立方厘米的标准条件下的干燥空气中携带的电荷 1 静电单位所需的 。后威廉 · 伦琴,在 1895 年发现 x 射线的德国科学家命名。
Industry:Environment