 |
| |||
| магнетрон | |||
| перматрон (一种热阴极充气放电二极管,由外加磁场控制放电) | |||
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