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反射时间: 26 phrases in 10 subjects |
Air defense | 1 |
Earth sciences | 5 |
Electronics | 2 |
Geophysics | 1 |
Hydroelectric power stations | 1 |
Metallurgy | 2 |
Nursing | 1 |
Oil / petroleum | 8 |
Space | 2 |
Technology | 3 |