 |
| |||
| 空穴-电子对 | |||
| hole-electron pair: 8 phrases in 6 subjects |
| Automobiles | 1 |
| Chemistry | 1 |
| Electronics | 2 |
| Metallurgy | 1 |
| Physics | 1 |
| Technology | 2 |
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