| |||
| 频率及计时间标准 | |||
|
frequency and time standard : 18 phrases in 9 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Business | 1 |
| Earth sciences | 2 |
| Electronics | 2 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 7 |
| Telecommunications | 2 |
| |||
| 频率及计时间标准 | |||
|
frequency and time standard : 18 phrases in 9 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Business | 1 |
| Earth sciences | 2 |
| Electronics | 2 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 7 |
| Telecommunications | 2 |