elastic arch
| method
| elastic arch | |
| bridg.constr. | 弹性拱 |
| method | |
| gen. | 法; 标准; 水平 |
| environ. | 方法 |
| hydroel.st. од. | 方法 |
| mech. | 电火花法 |
| |||
| 弹性拱 | |||
|
elastic arch : 4 phrases in 2 subjects |
| Bridge construction | 2 |
| Technology | 2 |