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放射性源 : 31 phrases in 11 subjects |
| Agriculture | 2 |
| Automobiles | 1 |
| Chemistry | 1 |
| Earth sciences | 4 |
| Electronics | 3 |
| General | 2 |
| Geophysics | 1 |
| Metallurgy | 1 |
| Nursing | 1 |
| Space | 2 |
| Technology | 13 |
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