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周 期 变化: 99 phrases in 25 subjects |
Agriculture | 2 |
Air defense | 1 |
Architecture | 1 |
Aviation | 1 |
Business | 2 |
Desert science | 1 |
Earth sciences | 2 |
Ecology | 1 |
Economy | 2 |
Electricity generation | 1 |
Electronics | 6 |
Engineering geology | 3 |
General | 8 |
Hydroelectric power stations | 2 |
Materials science | 1 |
Metallurgy | 4 |
Nautical | 2 |
Oil / petroleum | 2 |
Polymers | 1 |
Securities | 1 |
Shipbuilding | 1 |
Space | 3 |
Technology | 49 |
Telecommunications | 1 |
Wind Energy | 1 |