脉 冲 周期 : 45 phrases in 13 subjects |
Air defense | 5 |
Artificial intelligence | 2 |
Aviation | 3 |
Electronics | 3 |
General | 1 |
Geophysics | 1 |
Information technology | 1 |
Metallurgy | 1 |
Oil / petroleum | 3 |
Space | 5 |
Technology | 15 |
Telecommunications | 4 |
Ultrasound | 1 |