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| 三通、声道的; 三路的 | |||
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three channel tracking receiver : 25 phrases in 8 subjects |
| Air defense | 3 |
| Chemistry | 2 |
| Electronics | 3 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Oil / petroleum | 1 |
| Plastics | 2 |
| Space | 3 |
| Technology | 10 |
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