| |||
| 三角闭合 (差) | |||
|
closure of triangle : 7 phrases in 4 subjects |
| Bridge construction | 1 |
| Oil / petroleum | 1 |
| Surveying | 1 |
| Technology | 4 |
| |||
| 三角闭合 (差) | |||
|
closure of triangle : 7 phrases in 4 subjects |
| Bridge construction | 1 |
| Oil / petroleum | 1 |
| Surveying | 1 |
| Technology | 4 |