A dense, silvery grey, radioactive metallic element, atomic number 43, chemically similar to rhenium, which occurs naturally only in trace amounts…
| 单词 | θ13557 |
| 释义 | the world > health and disease > healing > diagnosis or prognosis > radiography or radiology > scanning > [noun] > tracer (1) technetium1947 A dense, silvery grey, radioactive metallic element, atomic number 43, chemically similar to rhenium, which occurs naturally only in trace amounts… |
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