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| radioactive background | |||
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| 放射性本底: 16 phrases in 11 subjects |
| Chemistry | 1 |
| Earth sciences | 2 |
| Electronics | 2 |
| General | 1 |
| Geophysics | 1 |
| Metallurgy | 1 |
| Nuclear physics | 1 |
| Oil / petroleum | 2 |
| Sports | 1 |
| Technology | 3 |
| Wind Energy | 1 |
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