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| spectral method; spectroscopic technique; spectroscopical technique | |||
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| spectrum approach | |||
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频 谱 法 : 25 phrases in 9 subjects |
| Air defense | 1 |
| Artificial intelligence | 2 |
| Chemistry | 1 |
| Earth sciences | 1 |
| Electronics | 13 |
| Geophysics | 1 |
| Oil / petroleum | 2 |
| Remote sensing | 1 |
| Technology | 3 |
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