| |||
| 描绘等高线 | |||
|
plot contour : 13 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Chemistry | 2 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Hydroelectric power stations | 1 |
| Space | 1 |
| Statistics | 1 |
| Technology | 2 |
| |||
| 描绘等高线 | |||
|
plot contour : 13 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Chemistry | 2 |
| Electronics | 2 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Hydroelectric power stations | 1 |
| Space | 1 |
| Statistics | 1 |
| Technology | 2 |