| |||
| 一等三角测量 | |||
| |||
| 一级三角测量 | |||
| 一等三角测量法; 一等三角测量 | |||
|
first order triangulation : 10 phrases in 3 subjects |
| Hydroelectric power stations | 2 |
| Surveying | 1 |
| Technology | 7 |
| |||
| 一等三角测量 | |||
| |||
| 一级三角测量 | |||
| 一等三角测量法; 一等三角测量 | |||
|
first order triangulation : 10 phrases in 3 subjects |
| Hydroelectric power stations | 2 |
| Surveying | 1 |
| Technology | 7 |