| English | eng-000 |
| optimum working frequency | |
| 普通话 | cmn-000 | 最佳工作频率 |
| 普通话 | cmn-000 | 最佳工椎率 |
| English | eng-000 | frequency optimum traffic |
| English | eng-000 | optimum operating frequency |
| English | eng-000 | optimum traffic frequency |
| русский | rus-000 | оптимальная рабочая частота |