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电光源 : 44 phrases in 14 subjects |
Air defense | 4 |
Chemistry | 1 |
Communications | 1 |
Earth sciences | 1 |
Electronics | 15 |
General | 4 |
Geophysics | 1 |
Metallurgy | 1 |
Oil / petroleum | 1 |
Rail transport | 2 |
Shipbuilding | 1 |
Space | 2 |
Technology | 8 |
Telecommunications | 2 |