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跟踪装置: 120 phrases in 17 subjects |
Air defense | 3 |
Astronautics | 1 |
Automobiles | 2 |
Aviation | 9 |
Business | 1 |
Drilling | 2 |
Earth sciences | 6 |
Electronics | 13 |
General | 3 |
Information technology | 1 |
Metallurgy | 4 |
Plastics | 1 |
Remote sensing | 1 |
Shipbuilding | 2 |
Space | 36 |
Steel production | 1 |
Technology | 34 |