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| 相前; 相位波前 | |||
| 相位波前; 波阵面 | |||
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phase front : 16 phrases in 6 subjects |
| Air defense | 4 |
| Athletics | 2 |
| Electronics | 3 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Oil / petroleum | 3 |
| Telecommunications | 2 |
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