| |||
| 回声探测法; 声波探测法 | |||
| 声波法; 共振法; 谐振法 | |||
|
sonic method : 6 phrases in 5 subjects |
| Chemistry | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Technology | 1 |
| |||
| 回声探测法; 声波探测法 | |||
| 声波法; 共振法; 谐振法 | |||
|
sonic method : 6 phrases in 5 subjects |
| Chemistry | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Technology | 1 |