研究 报告: 74 phrases in 19 subjects |
Agriculture | 1 |
Animal husbandry | 2 |
Aviation | 6 |
Bridge construction | 1 |
Business | 3 |
Commerce | 1 |
Earth sciences | 10 |
Economy | 4 |
Electronics | 7 |
General | 9 |
Geophysics | 1 |
Hydroelectric power stations | 5 |
Securities | 4 |
Shipbuilding | 1 |
Space | 3 |
Technology | 12 |
Telecommunications | 1 |
Textile industry | 1 |
United States | 2 |