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Iridium - Wikipedia, the free encyclopedia
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日期：2026-04-27
Iridium is a chemical element with symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum family, iridium is generally credited ... 1 Characteristics 1.1 Physical properties 1.2 Chemical properties 1.3 Compoun...看更多
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