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| 放 射 性同位素: 184 phrases in 28 subjects |
| Agriculture | 4 |
| Animal husbandry | 2 |
| Automobiles | 1 |
| Aviation | 2 |
| Biotechnology | 1 |
| Chemistry | 8 |
| Dermatology | 3 |
| Desert science | 1 |
| Earth sciences | 14 |
| Ecology | 3 |
| Electronics | 18 |
| Energy industry | 1 |
| Engineering geology | 1 |
| General | 5 |
| Geology | 1 |
| Geophysics | 4 |
| Life sciences | 2 |
| Medical | 1 |
| Metallurgy | 8 |
| Nautical | 1 |
| Nursing | 4 |
| Oil / petroleum | 10 |
| Reproductive biology | 2 |
| Space | 7 |
| Surgery | 4 |
| Technology | 74 |
| Water resources | 1 |
| Wind Energy | 1 |
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