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| 放射性核素发生器; 同位素发生器 | |||
| 放射性同位素发生器 | |||
| radioisotope generator: 8 phrases in 5 subjects |
| Earth sciences | 1 |
| Geology | 1 |
| Space | 3 |
| Technology | 2 |
| Water resources | 1 |
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