normal ratio
| method
| normal ratio | |
| oil | 正常场比值 |
| method | |
| gen. | 法; 标准; 水平 |
| environ. | 方法 |
| hydroel.st. од. | 方法 |
| mech. | 电火花法 |
| |||
| 正常场比值 (电磁法勘探) | |||
|
normal ratio : 7 phrases in 6 subjects |
| Aviation | 1 |
| Electronics | 1 |
| Oceanography & oceanology | 1 |
| Oil / petroleum | 2 |
| Sealing | 1 |
| Technology | 1 |