frequency-selective
| relay
| frequency selective | |
| space | 频率选择; 选频 |
| Relay | |
| space | 中继 |
| relay | |
| el.mach. | 电气继电器; 继电器 |
| forestr. | 分程传递 |
| hydroel.st. од. | 继电器 |
| interntl.trade. | 转送; 补充; 接替 |
| met. | 替续器; 中继站 |
| |||
| 频率选择; 选频 | |||
| |||
| 频率选择的 | |||
|
frequency-selective : 48 phrases in 10 subjects |
| Air defense | 3 |
| Aviation | 2 |
| Communications | 6 |
| Electronics | 11 |
| Geophysics | 1 |
| Information technology | 2 |
| Nautical | 2 |
| Space | 11 |
| Technology | 7 |
| Telecommunications | 3 |