特征曲线 : 59 phrases in 16 subjects |
Agriculture | 2 |
Aviation | 2 |
Bridge construction | 1 |
Business | 3 |
Earth sciences | 3 |
Ecology | 1 |
Economy | 2 |
Electronics | 2 |
Engineering geology | 1 |
Environment | 1 |
Metallurgy | 2 |
Oil / petroleum | 1 |
Space | 1 |
Technology | 35 |
Water resources | 1 |
Wind Energy | 1 |