变分法: 71 phrases in 25 subjects |
Agriculture | 2 |
Animal husbandry | 1 |
Architecture | 1 |
Aviation | 3 |
Bridge construction | 2 |
Business | 2 |
Chemistry | 1 |
Construction | 1 |
Corporate governance | 1 |
Earth sciences | 2 |
Ecology | 1 |
Economy | 2 |
Electronics | 21 |
Engineering geology | 1 |
Hydroelectric power stations | 2 |
Information technology | 1 |
Mathematics | 1 |
Oil / petroleum | 1 |
Perfume | 1 |
Polymers | 1 |
Securities | 1 |
Space | 2 |
Statistics | 1 |
Technology | 17 |
Telecommunications | 2 |