| 单词 | technetium |
| 释义 | technetium [tek`nē·shē·ǝm] CHEMISTRY A transition element, symbol Tc, atomic number 43; derived from uranium and plutonium fission products; chemically similar to rhenium and manganese; isotope 99Tc has a half-life of 200,000 years; used to absorb slow neutrons in reactor technology. METALLURGY Silver-gray metal with a high melting point, slightly magnetic. |
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