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| characteristic X-radiation | |||
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| characteristic radiation | |||
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特性辐射 : 17 phrases in 7 subjects |
| Air defense | 2 |
| Aviation | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 2 |
| Shipbuilding | 1 |
| Space | 3 |
| Technology | 6 |
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