 |
| |||
| alternating polarity | |||
|
交变极性 : 3 phrases in 3 subjects |
| Electronics | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Add | The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Report an error
| Get short URL | Language Selection Tips