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| Millikan rays; ultra-X ray | |||
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| ultra-gamma ray | |||
| 超 γ 射 线: 16 phrases in 6 subjects |
| Air defense | 1 |
| Electronics | 3 |
| General | 2 |
| Metallurgy | 3 |
| Space | 1 |
| Technology | 6 |
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