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标准频率和时间信号
| 业务
| 标准频率和时间信号 | |
| avia. | standard frequency and time signal |
| 业务 | |
| gen. | occupational activities; professional work |
| environ. | branch of activity |
| hydroel.st. | transaction |
| interntl.trade. | business |
| met. | occupation |
| wind. | service |
| 200 业务 | |
| IT | 200 service |
| 800 业务 | |
| IT | 800 service |
| |||
| standard frequency and time signal | |||
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标准频率和时间信号 : 5 phrases in 3 subjects |
| Space | 1 |
| Technology | 3 |
| Telecommunications | 1 |
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